-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
-<head>
- <meta content="text/html; charset=UTF-8" http-equiv="content-type">
- <title>lambda_delta home page</title>
- <meta content="Ferruccio Guidi" name="author">
- <meta content="The formal system lambda_delta" name="description">
- <link rel="shortcut icon" href="download/crux_16.ico">
-</head>
-<body>
-<div style="text-align: center;">
-<br>
-<a href="http://lambda-delta.info"><img alt="[Crux Logo]"
- title="The Crux" src="download/crux_32.png"
- style="border: 0px solid ; width: 32px; height: 32px;"></a>
-<h1>The Formal System λδ (lambda_delta)<br>
-</h1>
-<h2>Towards the unification of terms, types, environments and contexts</h2>
-<img style="width: 95%; height: 4px;" alt="[Separator]"
- title="Separator" src="download/rainbow.png"><br>
-<table
- style="text-align: left; width: 95%; margin-left: auto; margin-right: auto;"
- border="0" cellpadding="2" cellspacing="20">
- <tbody>
- <tr>
- <td style="vertical-align: top;">
- <ul>
- <li><a href="index.html">Foreword</a></li>
- </ul>
- <ul>
- <li><a href="news.html">News</a></li>
- </ul>
- <ul>
- <li>Papers</li>
- </ul>
- <ul>
- <li><a href="implementation.html">Resources</a><br>
- </li>
- </ul>
- </td>
- <td style="vertical-align: top; text-align: left;">
- <h3 style="text-align: right;">Documentation <img
- style="width: 37px; height: 37px;" alt="[Butterfly]" title="Butterfly"
- src="download/b5.png"></h3>
-Currently the <span style="font-weight: bold;">main source of
-information</span> on λδ (version 1) is <span
- style="font-weight: bold;">Resource
-1.1</span> below.<br>
-A <span style="font-weight: bold;">summary</span> of basic λδ (version
-1) is found in <span style="font-weight: bold;">Resource 1.5</span>
-below.<br>
- <h3><img style="width: 32px; height: 32px;"
- alt="[Basic lambda_delta Logo]" title="Basic lambda_delta"
- src="download/basic_32.png"> Basic λδ version 2 (in progress):</h3>
- <table style="text-align: left; width: 100%;" border="0"
- cellpadding="2" cellspacing="2">
+ <head>
+ <meta content="text/html; charset=UTF-8" http-equiv="content-type">
+ <title>lambda_delta home page</title>
+ <meta content="Ferruccio Guidi" name="author">
+ <meta content="The formal system lambda_delta" name="description">
+ <link rel="shortcut icon" href="download/crux_16.ico">
+ </head>
+ <body>
+ <div style="text-align: center;">
+ <br>
+ <a href="http://lambda-delta.info"><img alt="[Crux Logo]"
+ title="The Crux" src="download/crux_32.png" style="border: 0px
+ solid ; width: 32px; height: 32px;"></a>
+ <h1>The Formal System λδ (lambda_delta)<br>
+ </h1>
+ <h2>Towards the unification of terms, types, environments and
+ contexts</h2>
+ <img style="width: 95%; height: 4px;" alt="[Separator]"
+ title="Separator" src="download/rainbow.png"><br>
+ <table style="text-align: left; width: 95%; margin-left: auto;
+ margin-right: auto;" border="0" cellpadding="2" cellspacing="20">
<tbody>
<tr>
- <td style="vertical-align: top;">2.1.<br>
+ <td style="vertical-align: top;">
+ <ul>
+ <li><a href="index.html">Foreword</a></li>
+ </ul>
+ <ul>
+ <li><a href="news.html">News</a></li>
+ </ul>
+ <ul>
+ <li>Papers</li>
+ </ul>
+ <ul>
+ <li><a href="implementation.html">Resources</a><br>
+ </li>
+ </ul>
</td>
- <td style="vertical-align: top;">F. Guidi: <a
- href="download/cie_2010.pdf"><span style="font-style: italic;">An
-Efficient
-Validation Procedure for the Formal System </span><span
- style="font-style: italic;">λδ</span></a><span
- style="font-style: italic;"></span>
-(<span style="font-weight: bold;">2010-07</span>). In <span
- style="font-style: italic;">CiE 2010 Local Proceedings</span>.
-University of Azores, CMATI Booklet, pp. 204-213. <a
- href="implementation.html#bibtex">BibTeX entry</a>.<br>
- <br>
- </td>
- </tr>
- <tr>
- <td style="vertical-align: top;">2.2.<br>
- </td>
- <td style="vertical-align: top;"> <a name="ublcs-2009-16"></a>F.
+ <td style="vertical-align: top; text-align: left;">
+ <h3 style="text-align: right;">Documentation <img
+ style="width: 37px; height: 37px;" alt="[Butterfly]"
+ title="Butterfly" src="download/b5.png"></h3>
+ Currently the <span style="font-weight: bold;">main
+ source of
+ information</span> on λδ (version 1) is <span
+ style="font-weight: bold;">Resource
+ 1.1</span> below.<br>
+ A <span style="font-weight: bold;">summary</span> of
+ basic λδ (version
+ 1) is found in <span style="font-weight: bold;">Resource
+ 1.5</span>
+ below.<br>
+ <h3><img style="width: 32px; height: 32px;" alt="[Basic
+ lambda_delta Logo]" title="Basic lambda_delta"
+ src="download/basic_32.png"> Basic λδ version 2 (in
+ progress):</h3>
+ <table style="text-align: left; width: 100%;" border="0"
+ cellpadding="2" cellspacing="2">
+ <tbody>
+ <tr>
+ <td style="vertical-align: top;">2.1.<br>
+ </td>
+ <td style="vertical-align: top;"><a name="ldp7"></a>F.
+ Guidi: <a href="download/cie_2010.pdf"><span
+ style="font-style: italic;">An
+ Efficient
+ Validation Procedure for the Formal System </span><span
+ style="font-style: italic;">λδ</span></a><span
+ style="font-style: italic;"></span>
+ (<span style="font-weight: bold;">2010-07</span>).
+ In <span style="font-style: italic;">CiE 2010
+ Local Proceedings</span>.
+ University of Azores, CMATI Booklet, pp. 204-213.
+ <a href="implementation.html#bibtex">BibTeX entry</a>.<br>
+ <br>
+ </td>
+ </tr>
+ <tr>
+ <td style="vertical-align: top;">2.2.<br>
+ </td>
+ <td style="vertical-align: top;"> <a name="ldp6"></a>F.
Guidi:
- <a
- href="http://www.cs.unibo.it/pub/TR/UBLCS/ABSTRACTS/2009.bib?ncstrl.cabernet//BOLOGNA-UBLCS-2009-16"><span
- style="font-style: italic;">Landau's
-"Grundlagen der Analysis" from Automath to lambda-delta</span></a> (<span
- style="font-weight: bold;">2009-09)</span>. University of
-Bologna, technical report UBLCS-2009-16. <a
- href="implementation.html#bibtex">BibTeX entry</a>.<br>
- <br>
- </td>
- </tr>
- <tr>
- <td style="vertical-align: top;">2.3.<br>
- </td>
- <td style="vertical-align: top;">F. Guidi: <a
- href="download/ld_talk_7s.pdf"><span style="font-style: italic;">An
-Efficient
-Validation Procedure for the Formal System λδ</span></a> (<span
- style="font-weight: bold;">2010-07</span>). Presentation
-at
-CiE
-2010
-(slides).<br>
- <br>
- </td>
- </tr>
- <tr>
- <td style="vertical-align: top;">2.4.<br>
- </td>
- <td style="vertical-align: top;">F. Guidi: <a
- href="download/ld_talk_6s.pdf"><span style="font-style: italic;">A
-Validator
-for the Formal System λδ</span></a> (revised <span
- style="font-weight: bold;">2010-02</span>). Presentation
-at
-the
-University
-of
-Bologna
-(slides). </td>
- </tr>
- </tbody>
- </table>
- <h3><img style="width: 32px; height: 32px;"
- alt="[Basic lambda_delta Logo]" title="Basic lambda_delta"
- src="download/basic_32.png"> Basic λδ version 1 (closed):</h3>
- <table style="text-align: left; width: 100%;" border="0"
- cellpadding="2" cellspacing="2">
- <tbody>
- <tr>
- <td style="vertical-align: top;">1.1.<br>
- </td>
- <td style="vertical-align: top;"><a name="tocl1"></a>F.
-Guidi: <a href="http://doi.acm.org/10.1145/1614431.1614436"><span
- style="font-style: italic;">The Formal System λδ</span></a> (<span
- style="font-weight: bold;">2009-10</span>). In ACM ToCL 11(1), Article
-No. 5 (<a href="http://tocl.acm.org/accepted/335guidi.pdf">accepted</a>
- <span style="font-weight: bold;">2008-07</span>). CoRR
-identifier <a href="http://arxiv.org/abs/cs/0611040"><span
- style="font-style: italic;"></span>cs/0611040</a> [v10] (revised <span
- style="font-weight: bold;">2008-09</span>). <a
- href="implementation.html#bibtex">BibTeX
-entry</a>.<br>
- <br>
- </td>
- </tr>
- <tr>
- <td style="vertical-align: top;">1.2.<br>
- </td>
- <td style="vertical-align: top;">F. Guidi: <a
- href="download/cie_2007.pdf"><span style="font-style: italic;">Lambda
-Types on the Lambda Calculus with
-Abbreviations</span></a> (<span style="font-weight: bold;">2007-06</span>).
-In
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- <span style="font-style: italic;">CiE 2007 Local Proceedings</span>.
-University
-of
-Siena,
-technical
-report
-487,
-p.
-387
-(abstract
-of
-a
-presentation).
-
-
-
-
-
-
-
-
- <a href="implementation.html#bibtex">BibTeX
-entry</a>.<br>
- <br>
- </td>
- </tr>
- <tr>
- <td style="vertical-align: top;">1.3.<br>
- </td>
- <td style="vertical-align: top;">F. Guidi: <a
- href="http://www.cs.unibo.it/pub/TR/UBLCS/ABSTRACTS/2006.bib?ncstrl.cabernet//BOLOGNA-UBLCS-2006-25"><span
- style="font-style: italic;">Lambda Types on the Lambda Calculus with
-Abbreviations</span></a> (<span style="font-weight: bold;">2006-11</span>).
-University
-of
-Bologna,
-technical
-report
-UBLCS-2006-25.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- <a href="implementation.html#bibtex">BibTeX
-entry</a>.<br>
- <br>
- </td>
- </tr>
- <tr>
- <td style="vertical-align: top;">1.4.<br>
- </td>
- <td style="vertical-align: top;">F. Guidi: <a
- style="font-style: italic;"
- href="http://www.cs.unibo.it/pub/TR/UBLCS/ABSTRACTS/2006.bib?ncstrl.cabernet//BOLOGNA-UBLCS-2006-01">Lambda
-Types
-on
-the
-Lambda
-Calculus
-with
-Abbreviations:
-a
-Certified
-Specification</a> (<span style="font-weight: bold;">2006-01</span>).
-University of
-Bologna, technical report UBLCS-2006-01. <a
- href="implementation.html#bibtex">BibTeX entry</a>.<br>
- <br>
- </td>
- </tr>
- <tr>
- <td style="vertical-align: top;">1.5.<br>
- </td>
- <td style="vertical-align: top;">F. Guidi: <a
- style="font-style: italic;" href="download/ld_talk_5s.pdf">The
-Formal
-System lambda-delta</a>
-(<span style="font-weight: bold;">2008-10</span>). Presentation at
-"Advances in Constructive Topology and Logical Foundations" (slides).<br>
- <br>
- </td>
- </tr>
- <tr>
- <td style="vertical-align: top;">1.6.<br>
- </td>
- <td style="vertical-align: top;">F. Guidi: <a
- href="download/ld_talk_4s.pdf"><span style="font-style: italic;">Towards
-the Unification of Terms, Types
-and Contexts</span></a> (<span style="font-weight: bold;">2008-03</span>).
-Presentation
-at
-Types
-2008
-(slides).<br>
- <br>
- </td>
- </tr>
- <tr>
- <td style="vertical-align: top;">1.7.<br>
- </td>
- <td style="vertical-align: top;">F. Guidi: <a
- href="download/ld_talk_3s.pdf"><span style="font-style: italic;">Lambda
-Types on the Lambda Calculus with
-Abbreviations</span></a> (<span style="font-weight: bold;">2007-06</span>).
-Presentation
-at
-CiE
-2007
-(slides).<br>
- <br>
- </td>
- </tr>
- <tr>
- <td style="vertical-align: top;">1.8.<br>
- </td>
- <td style="vertical-align: top;">F. Guidi: <a
- href="download/ld_talk_2s.pdf"><span style="font-style: italic;">Lambda
-Tipi sul Lambda Calcolo con
-Abbreviazioni</span></a> (<span style="font-weight: bold;">2007-01</span>).
-Presentation
-at
-the
-University
-of
-Padova
-(slides
-
-
-
-
-
-
-
- <span style="font-weight: bold;">in
-Italian</span>).<br>
- <br>
- </td>
- </tr>
- <tr>
- <td style="vertical-align: top;">1.9.<br>
- </td>
- <td style="vertical-align: top;"><a name="bologna1"></a>F.
-Guidi: <a href="download/ld_talk_1s.pdf"><span
- style="font-style: italic;">Lambda Tipi sul Lambda Calcolo con
-Abbreviazioni: una Specifica Certificata</span></a> (<span
- style="font-weight: bold;">2005-12</span>). Presentation at
-the University of Bologna (slides <span style="font-weight: bold;">in
-Italian</span>).<br>
+ <a
+href="http://www.cs.unibo.it/pub/TR/UBLCS/ABSTRACTS/2009.bib?ncstrl.cabernet//BOLOGNA-UBLCS-2009-16"><span
+ style="font-style: italic;">Landau's
+ "Grundlagen der Analysis" from Automath to
+ lambda-delta</span></a> (<span
+ style="font-weight: bold;">2009-09)</span>.
+ University of
+ Bologna, technical report UBLCS-2009-16. <a
+ href="implementation.html#bibtex">BibTeX entry</a>.<br>
+ <br>
+ </td>
+ </tr>
+ <tr>
+ <td style="vertical-align: top;">2.3.<br>
+ </td>
+ <td style="vertical-align: top;"><a name="ldt7"></a>F.
+ Guidi: <a href="download/ld_talk_7s.pdf"><span
+ style="font-style: italic;">An
+ Efficient
+ Validation Procedure for the Formal System λδ</span></a>
+ (<span style="font-weight: bold;">2010-07</span>).
+ Presentation
+ at
+ CiE
+ 2010
+ (slides).<br>
+ <br>
+ </td>
+ </tr>
+ <tr>
+ <td style="vertical-align: top;">2.4.<br>
+ </td>
+ <td style="vertical-align: top;"><a name="ldt6"></a>F.
+ Guidi: <a href="download/ld_talk_6s.pdf"><span
+ style="font-style: italic;">A
+ Validator
+ for the Formal System λδ</span></a> (revised <span
+ style="font-weight: bold;">2010-02</span>).
+ Presentation
+ at
+ the
+ University
+ of
+ Bologna
+ (slides). </td>
+ </tr>
+ </tbody>
+ </table>
+ <h3><img style="width: 32px; height: 32px;" alt="[Basic
+ lambda_delta Logo]" title="Basic lambda_delta"
+ src="download/basic_32.png"> Basic λδ version 1
+ (closed):</h3>
+ <table style="text-align: left; width: 100%;" border="0"
+ cellpadding="2" cellspacing="2">
+ <tbody>
+ <tr>
+ <td style="vertical-align: top;">1.1.<br>
+ </td>
+ <td style="vertical-align: top;"><a name="ldp5"></a>F.
+Guidi:
+ <a
+ href="http://doi.acm.org/10.1145/1614431.1614436"><span
+ style="font-style: italic;">The Formal System
+ λδ</span></a> (<span style="font-weight:
+ bold;">2009-10</span>). In ACM ToCL 11(1),
+ Article
+ No. 5 (<a
+ href="http://tocl.acm.org/accepted/335guidi.pdf">accepted</a>
+ <span style="font-weight: bold;">2008-07</span>).
+ CoRR
+ identifier <a
+ href="http://arxiv.org/abs/cs/0611040"><span
+ style="font-style: italic;"></span>cs/0611040</a>
+ [v10] (revised <span style="font-weight: bold;">2008-09</span>).
+ <a href="implementation.html#bibtex">BibTeX
+ entry</a>.<br>
+ <br>
+ </td>
+ </tr>
+ <tr>
+ <td style="vertical-align: top;">1.2.<br>
+ </td>
+ <td style="vertical-align: top;"><a name="ldp4"></a>F.
+ Guidi: <a href="download/cie_2007.pdf"><span
+ style="font-style: italic;">Lambda
+ Types on the Lambda Calculus with
+ Abbreviations</span></a> (<span
+ style="font-weight: bold;">2007-06</span>).
+ In <span style="font-style: italic;">CiE 2007
+ Local Proceedings</span>.
+ University
+ of
+ Siena,
+ technical
+ report
+ 487,
+ p.
+ 387
+ (abstract
+ of
+ a
+ presentation). <a
+ href="implementation.html#bibtex">BibTeX
+ entry</a>.<br>
+ <br>
+ </td>
+ </tr>
+ <tr>
+ <td style="vertical-align: top;">1.3.<br>
+ </td>
+ <td style="vertical-align: top;"><a name="ldp3"></a>F.
+ Guidi: <a
+href="http://www.cs.unibo.it/pub/TR/UBLCS/ABSTRACTS/2006.bib?ncstrl.cabernet//BOLOGNA-UBLCS-2006-25"><span
+ style="font-style: italic;">Lambda Types on
+ the Lambda Calculus with
+ Abbreviations</span></a> (<span
+ style="font-weight: bold;">2006-11</span>).
+ University
+ of
+ Bologna,
+ technical
+ report
+ UBLCS-2006-25. <a
+ href="implementation.html#bibtex">BibTeX
+ entry</a>.<br>
+ <br>
+ </td>
+ </tr>
+ <tr>
+ <td style="vertical-align: top;">1.4.<br>
+ </td>
+ <td style="vertical-align: top;"><a name="ldp2"></a>F.
+ Guidi: <a style="font-style: italic;"
+href="http://www.cs.unibo.it/pub/TR/UBLCS/ABSTRACTS/2006.bib?ncstrl.cabernet//BOLOGNA-UBLCS-2006-01">Lambda
+ Types
+ on
+ the
+ Lambda
+ Calculus
+ with
+ Abbreviations:
+ a
+ Certified
+ Specification</a> (<span style="font-weight:
+ bold;">2006-01</span>).
+ University of
+ Bologna, technical report UBLCS-2006-01. <a
+ href="implementation.html#bibtex">BibTeX entry</a>.<br>
+ <br>
+ </td>
+ </tr>
+ <tr>
+ <td style="vertical-align: top;">1.5.<br>
+ </td>
+ <td style="vertical-align: top;"><a name="ldt5"></a>F.
+ Guidi: <a style="font-style: italic;"
+ href="download/ld_talk_5s.pdf">The
+ Formal
+ System lambda-delta</a>
+ (<span style="font-weight: bold;">2008-10</span>).
+ Presentation at
+ "Advances in Constructive Topology and Logical
+ Foundations" (slides).<br>
+ <br>
+ </td>
+ </tr>
+ <tr>
+ <td style="vertical-align: top;">1.6.<br>
+ </td>
+ <td style="vertical-align: top;"><a name="ldt4"></a>F.
+ Guidi: <a href="download/ld_talk_4s.pdf"><span
+ style="font-style: italic;">Towards
+ the Unification of Terms, Types
+ and Contexts</span></a> (<span
+ style="font-weight: bold;">2008-03</span>).
+ Presentation
+ at
+ Types
+ 2008
+ (slides).<br>
+ <br>
+ </td>
+ </tr>
+ <tr>
+ <td style="vertical-align: top;">1.7.<br>
+ </td>
+ <td style="vertical-align: top;"><a name="ldt3"></a>F.
+ Guidi: <a href="download/ld_talk_3s.pdf"><span
+ style="font-style: italic;">Lambda
+ Types on the Lambda Calculus with
+ Abbreviations</span></a> (<span
+ style="font-weight: bold;">2007-06</span>).
+ Presentation
+ at
+ CiE
+ 2007
+ (slides).<br>
+ <br>
+ </td>
+ </tr>
+ <tr>
+ <td style="vertical-align: top;">1.8.<br>
+ </td>
+ <td style="vertical-align: top;"><a name="ldt2"></a>F.
+ Guidi: <a href="download/ld_talk_2s.pdf"><span
+ style="font-style: italic;">Lambda
+ Tipi sul Lambda Calcolo con
+ Abbreviazioni</span></a> (<span
+ style="font-weight: bold;">2007-01</span>).
+ Presentation
+ at
+ the
+ University
+ of
+ Padova
+ (slides <span style="font-weight: bold;">in
+ Italian</span>).<br>
+ <br>
+ </td>
+ </tr>
+ <tr>
+ <td style="vertical-align: top;">1.9.<br>
+ </td>
+ <td style="vertical-align: top;"><a name="ldt1"></a>F.
+Guidi:
+ <a href="download/ld_talk_1s.pdf"><span
+ style="font-style: italic;">Lambda Tipi sul
+ Lambda Calcolo con
+ Abbreviazioni: una Specifica Certificata</span></a>
+ (<span style="font-weight: bold;">2005-12</span>).
+ Presentation at
+ the University of Bologna (slides <span
+ style="font-weight: bold;">in
+ Italian</span>).<br>
+ </td>
+ </tr>
+ </tbody>
+ </table>
</td>
</tr>
</tbody>
</table>
- </td>
- </tr>
- </tbody>
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+ Guidi</a><br>
+ </div>
+ </body>
</html>
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
-<head>
- <meta content="text/html; charset=UTF-8" http-equiv="content-type">
- <title>lambda_delta home page</title>
- <meta content="Ferruccio Guidi" name="author">
- <meta content="The formal system lambda_delta" name="description">
- <link rel="shortcut icon" href="download/crux_16.ico">
-</head>
-<body>
-<div style="text-align: center;">
-<br>
-<a href="http://lambda-delta.info"><img alt="[Crux Logo]"
- title="The Crux" src="download/crux_32.png"
- style="border: 0px solid ; width: 32px; height: 32px;"></a>
-<h1>The Formal System λδ (lambda_delta)<br>
-</h1>
-<h2>Towards the unification of terms, types, environments and contexts</h2>
-<img style="width: 95%; height: 4px;" alt="[Separator]"
- title="Separator" src="download/rainbow.png"><br>
-<table
- style="text-align: left; width: 95%; margin-left: auto; margin-right: auto;"
- border="0" cellpadding="2" cellspacing="20">
- <tbody>
- <tr>
- <td style="vertical-align: top;">
- <ul>
- <li><a href="index.html">Foreword</a></li>
- </ul>
- <ul>
- <li><a href="news.html">News</a></li>
- </ul>
- <ul>
- <li><a href="documentation.html">Papers</a></li>
- </ul>
- <ul>
- <li>Resources<br>
- </li>
- </ul>
- </td>
- <td style="vertical-align: top; text-align: left;">
- <h3 style="text-align: right;">Computer-checked formal
-specifications <img style="width: 37px; height: 37px;"
- alt="[Butterfly]" title="Butterfly" src="download/b9.png"></h3>
- <span style="font-weight: bold;">Resource
-1</span> below provides for the statically generated <span
- style="font-weight: bold;">natural language representation</span> of
-λδ meta-theory (faster rendering w.r.t. resource 2 below).<br>
- <span style="font-weight: bold;">Resource 2</span> below provides
-for the dynamically generated <span style="font-weight: bold;">natural
-language representation</span> of
-λδ meta-theory (powered by the <a href="http://helm.cs.unibo.it/">HELM</a>
-rendering engine).<br>
-Remarkably, λδ was born and developed in the digital format of <span
- style="font-weight: bold;">resource 3</span> below, which is not the
-formal counterpart of some informal material previously written on
-paper (as it happens for most currently digitalized Mathematics).<br>
- <ol>
- <li><a name="static"></a>F. Guidi: <a
- style="font-style: italic;" href="static/matita/lambda_delta/">lambda_delta</a>
-(revised <span style="font-weight: bold;">2011-09</span>). Formal
-specification for <a href="http://matita.cs.unibo.it/">Matita</a> 0.5
-(HTML pages generated
-by the <a href="http://helm.cs.unibo.it/">HELM</a>
-rendering engine)<br>
-Here are the most relevant theorems proved in the formal specification:
- <ul>
- <li><a
- href="static/matita/lambda_delta/Basic_1/pr3/pr3/pr3_confluence.con.html">Confluence
-of
-reduction</a> (Church-Rosser property).</li>
- <li><a
- href="static/matita/lambda_delta/Basic_1/ty3/props/ty3_correct.con.html">Correctness
-of
-types</a>.</li>
- <li><a
- href="static/matita/lambda_delta/Basic_1/ty3/props/ty3_unique.con.html">Uniqueness
-of
-types
-up
-to
-conversion</a>.<br>
- </li>
- <li><a
- href="static/matita/lambda_delta/Basic_1/ty3/pr3/ty3_sred_pr3.con.html">Subject
-reduction
-of
-the
-type
-assignment</a>.</li>
- <li><a
- href="static/matita/lambda_delta/Basic_1/ty3/arity_props/ty3_sn3.con.html">Strong
-normalization
-of
-the
-typed
-terms</a>.</li>
- <li><a
- href="static/matita/lambda_delta/Basic_1/ty3/dec/ty3_inference.con.html">Decidability
-of
-the
-type
-inference
-problem</a>.<br>
- <br>
- </li>
- </ul>
- </li>
- <li><a name="dynamic"></a>F. Guidi: <a
- style="font-style: italic;"
- href="http://mowgli.cs.unibo.it:58080/apply?keys=RT&xmluri=http://helm.cs.unibo.it/helm//html/folder/index.html&prop.media-type=text/html&param.thmedia-type=text/html&param.thkeys=T1%2CT2%2CL%2CE&param.embedkeys=d_c%2CTC1%2CHC2%2CL&param.thencoding=UTF-8&prop.encoding=UTF-8&prop.doctype-public=-//W3C//DTD%20XHTML%201.0%20Transitional//EN&param.doctype-public=-//W3C//DTD%20XHTML%201.0%20Transitional//EN&param.encoding=UTF-8&param.media-type=text/html&param.keys=d_c%2CC1%2CHC2%2CL&profile=default&param.profile=default&param.CICURI=theory:/matita/lambda_delta/">lambda_delta</a>
-(revised <span style="font-weight: bold;">2011-09</span>). Formal
-specification for <a href="http://matita.cs.unibo.it/">Matita</a> 0.5 (<a
- href="http://helm.cs.unibo.it/">HELM</a> directory).<br>
- <br>
- </li>
- <li><a name="source"></a>F. Guidi: <a
- href="download/lambda_delta_1.tar.gz"><span style="font-style: italic;">lambda_delta_1</span></a>
-(revised <span style="font-weight: bold;">2011-09</span>).
-Formal specification for <span style="font-weight: bold;">Coq 7.3.1</span>
-(source
-proof scripts). <a href="#bibtex">BibTeX entry</a>.<br>
- </li>
- </ol>
- <h3 style="text-align: right;">Tools <img
- style="width: 37px; height: 37px;" alt="[Butterfly]" title="Butterfly"
- src="download/b5.png"></h3>
- <a name="lddl"></a><img style="width: 32px; height: 32px;"
- alt="[Crux Logo]" title="The Crux" src="download/crux_32.png"><span
- style="font-weight: bold;"> </span>The <span
- style="font-weight: bold;"><span style="text-decoration: underline;">λδ
-Digital
-Library
-(LDDL)</span></span> is part of <a href="http://helm.cs.unibo.it/">HELM</a>
-and contains a set of
-resources expressed in λδ.<br>
- <ul>
- <li><span style="font-weight: bold;">Contents:</span> Landau's "<span
- style="font-style: italic;">Grundlagen der Analysis</span>" (from
-Jutting's specification in <a href="http://www.win.tue.nl/automath/">Automath</a>).<br>
- <span style="font-weight: bold;"></span></li>
- </ul>
- <ul>
- <li><span style="font-weight: bold;">Access:</span> <a
- href="static/lddl/">static pages</a> (updated <span
- style="font-weight: bold;">2011-09</span>), <a
- href="download/lddl.tar.bz2">data set</a> (updated <span
- style="font-weight: bold;">2011-09</span>), <a
- href="http://lambda-delta.info/xml">HELM server URL</a>
-(updated <span style="font-weight: bold;">2011-09</span>).</li>
- </ul>
- <ul>
- <li><span style="font-weight: bold;">Examples:</span> <a
- href="static/lddl/brg_si/grundlagen/l/e/st/eq/landau/n/rt/rp/r/c/8283/t234.ld.html">Grundlagen's
-definition
-"t234"</a> (in "basic_rg" λδ), <a
- href="static/lddl/crg_si/grundlagen/l/e/st/eq/landau/n/rt/rp/r/c/8283/t234.ld.html">Grundlagen's
-definition
-"t234"</a> (in "complete_rg" λδ).<br>
- </li>
- </ul>
+ <head>
+ <meta content="text/html; charset=UTF-8" http-equiv="content-type">
+ <title>lambda_delta home page</title>
+ <meta content="Ferruccio Guidi" name="author">
+ <meta content="The formal system lambda_delta" name="description">
+ <link rel="shortcut icon" href="download/crux_16.ico">
+ </head>
+ <body>
+ <div style="text-align: center;">
<br>
- <a name="helena"></a><span style="font-weight: bold;"><img
- style="width: 32px; height: 32px;" alt="[Helena Logo]" title="Helena"
- src="download/helena_32.png"> <span
- style="text-decoration: underline;">Helena</span></span> is a λδ
-processor,
-implemented in <a href="http://caml.inria.fr/">Caml</a> as a part of
-the <a href="http://helm.cs.unibo.it/">HELM</a> software, meant for
-testing the stable features of the calculus as well as the unstable
-ones.<br>
-The processor source code is available in the directory <a
- href="http://helm.cs.unibo.it/websvn/listing.php?repname=helm&path=%2Ftrunk%2Fhelm%2Fsoftware%2Fhelena%2F&rev=0&sc=0">/trunk/helm/software/helena/</a>
-of the <a href="http://helm.cs.unibo.it/software/index.html">HELM Svn
-repository</a>. The Svn revisions containing the stable versions
-of Helena are indicated below. <br>
- <ul>
- </ul>
- <ul>
- <li><span style="font-weight: bold;">Version 0.8.2.</span> In
-progress.<br>
- </li>
- </ul>
- <ul>
- <li><span style="font-weight: bold;">Version 0.8.1 (2010-11).</span>
-Exploits a subset of "complete_rg" λδ as the intermediate language.
-Features importation from ".hln" files containing λδ textual syntax.
-The overall validation speed of the "<span style="font-style: italic;">Grundlagen
-der
-Analysis</span>" increases of 22% with respect to version 0.8.0. [Svn
-revision: 11032] (<a href="download/helena_0.8.1.tar.gz">archived
-source code</a>)
- <ul>
- <li><span style="font-weight: bold;">2009-12.</span> Helena
-appears in F. Wiedijk's <a
- href="http://www.cs.ru.nl/%7Efreek/digimath/index.html#helena">index
+ <a href="http://lambda-delta.info"><img alt="[Crux Logo]"
+ title="The Crux" src="download/crux_32.png" style="border: 0px
+ solid ; width: 32px; height: 32px;"></a>
+ <h1>The Formal System λδ (lambda_delta)<br>
+ </h1>
+ <h2>Towards the unification of terms, types, environments and
+ contexts</h2>
+ <img style="width: 95%; height: 4px;" alt="[Separator]"
+ title="Separator" src="download/rainbow.png"><br>
+ <table style="text-align: left; width: 95%; margin-left: auto;
+ margin-right: auto;" border="0" cellpadding="2" cellspacing="20">
+ <tbody>
+ <tr>
+ <td style="vertical-align: top;">
+ <ul>
+ <li><a href="index.html">Foreword</a></li>
+ </ul>
+ <ul>
+ <li><a href="news.html">News</a></li>
+ </ul>
+ <ul>
+ <li><a href="documentation.html">Papers</a></li>
+ </ul>
+ <ul>
+ <li>Resources<br>
+ </li>
+ </ul>
+ </td>
+ <td style="vertical-align: top; text-align: left;">
+ <h3 style="text-align: right;">Computer-checked formal
+ specifications <img style="width: 37px; height: 37px;"
+ alt="[Butterfly]" title="Butterfly"
+ src="download/b9.png"></h3>
+ <span style="font-weight: bold;">Resource
+ 1</span> below provides for the statically generated <span
+ style="font-weight: bold;">natural language
+ representation</span> of
+ λδ meta-theory (faster rendering w.r.t. resource 2 below).<br>
+ <span style="font-weight: bold;">Resource 2</span> below
+ provides
+ for the dynamically generated <span style="font-weight:
+ bold;">natural
+ language representation</span> of
+ λδ meta-theory (powered by the <a
+ href="http://helm.cs.unibo.it/">HELM</a>
+ rendering engine).<br>
+ Remarkably, λδ was born and developed in the digital
+ format of <span style="font-weight: bold;">resource 3</span>
+ below, which is not the
+ formal counterpart of some informal material previously
+ written on
+ paper (as it happens for most currently digitalized
+ Mathematics).<br>
+ <ol>
+ <li><a name="static"></a>F. Guidi: <a
+ style="font-style: italic;"
+ href="static/matita/lambda_delta/">lambda_delta</a>
+ (revised <span style="font-weight: bold;">2011-09</span>).
+ Formal
+ specification for <a
+ href="http://matita.cs.unibo.it/">Matita</a> 0.5
+ (HTML pages generated
+ by the <a href="http://helm.cs.unibo.it/">HELM</a>
+ rendering engine)<br>
+ Here are the most relevant theorems proved in the
+ formal specification:
+ <ul>
+ <li><a
+href="static/matita/lambda_delta/Basic_1/pr3/pr3/pr3_confluence.con.html">Confluence
+ of
+ reduction</a> (Church-Rosser property).</li>
+ <li><a
+ href="static/matita/lambda_delta/Basic_1/ty3/props/ty3_correct.con.html">Correctness
+ of
+ types</a>.</li>
+ <li><a
+ href="static/matita/lambda_delta/Basic_1/ty3/props/ty3_unique.con.html">Uniqueness
+ of
+ types
+ up
+ to
+ conversion</a>.<br>
+ </li>
+ <li><a
+ href="static/matita/lambda_delta/Basic_1/ty3/pr3/ty3_sred_pr3.con.html">Subject
+ reduction
+ of
+ the
+ type
+ assignment</a>.</li>
+ <li><a
+href="static/matita/lambda_delta/Basic_1/ty3/arity_props/ty3_sn3.con.html">Strong
+ normalization
+ of
+ the
+ typed
+ terms</a>.</li>
+ <li><a
+ href="static/matita/lambda_delta/Basic_1/ty3/dec/ty3_inference.con.html">Decidability
+ of
+ the
+ type
+ inference
+ problem</a>.<br>
+ <br>
+ </li>
+ </ul>
+ </li>
+ <li><a name="dynamic"></a>F. Guidi: <a
+ style="font-style: italic;"
+href="http://mowgli.cs.unibo.it:58080/apply?keys=RT&xmluri=http://helm.cs.unibo.it/helm//html/folder/index.html&prop.media-type=text/html&param.thmedia-type=text/html&param.thkeys=T1%2CT2%2CL%2CE&param.embedkeys=d_c%2CTC1%2CHC2%2CL&param.thencoding=UTF-8&prop.encoding=UTF-8&prop.doctype-public=-//W3C//DTD%20XHTML%201.0%20Transitional//EN&param.doctype-public=-//W3C//DTD%20XHTML%201.0%20Transitional//EN&param.encoding=UTF-8&param.media-type=text/html&param.keys=d_c%2CC1%2CHC2%2CL&profile=default&param.profile=default&param.CICURI=theory:/matita/lambda_delta/">lambda_delta</a>
+ (revised <span style="font-weight: bold;">2011-09</span>).
+ Formal
+ specification for <a
+ href="http://matita.cs.unibo.it/">Matita</a> 0.5 (<a
+ href="http://helm.cs.unibo.it/">HELM</a> directory).<br>
+ <br>
+ </li>
+ <li><a name="ldp1"></a>F. Guidi: <a
+ href="download/lambda_delta_1.tar.gz"><span
+ style="font-style: italic;">lambda_delta_1</span></a>
+ (revised <span style="font-weight: bold;">2011-09</span>).
+Formal
+ specification for <span style="font-weight: bold;">Coq
+ 7.3.1</span>
+ (source
+ proof scripts). <a href="#bibtex">BibTeX entry</a>.<br>
+ </li>
+ </ol>
+ <h3 style="text-align: right;">Tools <img style="width:
+ 37px; height: 37px;" alt="[Butterfly]"
+ title="Butterfly" src="download/b5.png"></h3>
+ <a name="lddl"></a><img style="width: 32px; height: 32px;"
+ alt="[Crux Logo]" title="The Crux"
+ src="download/crux_32.png"><span style="font-weight:
+ bold;"> </span>The <span style="font-weight: bold;"><span
+ style="text-decoration: underline;">λδ
+ Digital
+ Library
+ (LDDL)</span></span> is part of <a
+ href="http://helm.cs.unibo.it/">HELM</a>
+ and contains a set of
+ resources expressed in λδ.<br>
+ <ul>
+ <li><span style="font-weight: bold;">Contents:</span>
+ Landau's "<span style="font-style: italic;">Grundlagen
+ der Analysis</span>" (from
+ Jutting's specification in <a
+ href="http://www.win.tue.nl/automath/">Automath</a>).<br>
+ <span style="font-weight: bold;"></span></li>
+ </ul>
+ <ul>
+ <li><span style="font-weight: bold;">Access:</span> <a
+ href="static/lddl/">static pages</a> (updated <span
+ style="font-weight: bold;">2011-09</span>), <a
+ href="download/lddl.tar.bz2">data set</a> (updated <span
+ style="font-weight: bold;">2011-09</span>), <a
+ href="http://lambda-delta.info/xml">HELM server URL</a>
+ (updated <span style="font-weight: bold;">2011-09</span>).</li>
+ </ul>
+ <ul>
+ <li><span style="font-weight: bold;">Examples:</span> <a
+href="static/lddl/brg_si/grundlagen/l/e/st/eq/landau/n/rt/rp/r/c/8283/t234.ld.html">Grundlagen's
+ definition
+ "t234"</a> (in "basic_rg" λδ), <a
+href="static/lddl/crg_si/grundlagen/l/e/st/eq/landau/n/rt/rp/r/c/8283/t234.ld.html">Grundlagen's
+ definition
+ "t234"</a> (in "complete_rg" λδ).<br>
+ </li>
+ </ul>
+ <br>
+ <a name="helena"></a><span style="font-weight: bold;"><img
+ style="width: 32px; height: 32px;" alt="[Helena Logo]"
+ title="Helena" src="download/helena_32.png"> <span
+ style="text-decoration: underline;">Helena</span></span>
+ is a λδ
+ processor,
+ implemented in <a href="http://caml.inria.fr/">Caml</a>
+ as a part of
+ the <a href="http://helm.cs.unibo.it/">HELM</a> software,
+ meant for
+ testing the stable features of the calculus as well as the
+ unstable
+ ones.<br>
+ The processor source code is available in the directory <a
+href="http://helm.cs.unibo.it/websvn/listing.php?repname=helm&path=%2Ftrunk%2Fhelm%2Fsoftware%2Fhelena%2F&rev=0&sc=0">/trunk/helm/software/helena/</a>
+ of the <a
+ href="http://helm.cs.unibo.it/software/index.html">HELM
+ Svn
+ repository</a>. The Svn revisions containing the stable
+ versions
+ of Helena are indicated below. <br>
+ <ul>
+ </ul>
+ <ul>
+ <li><span style="font-weight: bold;">Version 0.8.2.</span>
+ In
+ progress.<br>
+ </li>
+ </ul>
+ <ul>
+ <li><span style="font-weight: bold;">Version 0.8.1
+ (2010-11).</span>
+ Exploits a subset of "complete_rg" λδ as the
+ intermediate language.
+ Features importation from ".hln" files containing λδ
+ textual syntax.
+ The overall validation speed of the "<span
+ style="font-style: italic;">Grundlagen
+ der
+ Analysis</span>" increases of 22% with respect to
+ version 0.8.0. [Svn
+ revision: 11032] (<a
+ href="download/helena_0.8.1.tar.gz">archived
+ source code</a>)
+ <ul>
+ <li><span style="font-weight: bold;">2009-12.</span>
+ Helena
+ appears in F. Wiedijk's <a
+ href="http://www.cs.ru.nl/%7Efreek/digimath/index.html#helena">index
of
-computer math systems</a>.</li>
- </ul>
- </li>
- </ul>
- <ul>
- <li><a style="font-weight: bold;"
- href="documentation.html#ublcs-2009-16">Version 0.8.0</a><span
- style="font-weight: bold;"> (2009-09).</span> Supports
-"basic_rg" λδ with naive implementation of impredicative sort
-inclusion. Features
-importation from <a href="http://www.win.tue.nl/automath/">Automath</a>
-and exportation to <a href="http://www.w3.org/XML/">XML</a>. [Svn
-revision: 10304] (<a href="download/helena_0.8.0.tar.gz">archived
-source code</a>)<br>
- <ul>
- <li><span style="font-weight: bold;">2009-09.</span>
-Jutting's specification of Landau's "<span style="font-style: italic;">Grundlagen
-der
-Analysis</span>" enters λδ Digital Library.<br>
- <span style="font-weight: bold;"></span></li>
- <li><span style="font-weight: bold;">2009-06.</span>
-Jutting's specification of Landau's "<span style="font-style: italic;">Grundlagen
-der
-Analysis</span>" is
-successfully processed, enabling sort inclusion<span
- style="font-weight: bold;"></span>.</li>
- </ul>
- </li>
- </ul>
- <h3 style="text-align: right;">Other resources <img
- style="width: 37px; height: 37px;" alt="[Butterfly]" title="Butterfly"
- src="download/b4.png"></h3>
- <ul>
- <li><a name="bibtex"></a>A
-BibTeX database of λδ documentation: <a
- href="download/lambda_delta.bib"><span style="font-style: italic;">lambda_delta.bib</span></a>,
-
-
-
- <a style="font-style: italic;"
- href="download/lambda_delta.txt">lambda_delta.txt</a> (revised <span
- style="font-weight: bold;">2011-09</span>).</li>
- </ul>
- <ul>
- <li>A <a href="http://www.jedsoft.org/jed/">Jed mode</a> for
-editing ".hln" files (containing λδ textual syntax): <a
- style="font-style: italic;" href="download/helena.sl">helena.sl</a>
-(revised <span style="font-weight: bold;">2010-11</span>).</li>
- </ul>
- <ul>
- <li>A <a href="http://www.jedsoft.org/jed/">Jed mode</a> for
-editing ".aut" files (containing <a
- href="http://www.win.tue.nl/automath/">Automath</a> textual syntax): <a
- style="font-style: italic;" href="download/automath.sl">automath.sl</a>
-(revised <span style="font-weight: bold;">2008-07</span>).</li>
- </ul>
- <ul>
- <li>A logo for "basic" λδ: <a href="download/bld.pdf"><span
- style="font-style: italic;">bld.pdf</span></a> (revised <span
- style="font-weight: bold;">2008-07</span>).<br>
- </li>
- </ul>
- </td>
- </tr>
- </tbody>
-</table>
-<br>
-<a href="http://validator.w3.org/check?uri=referer"><img
- alt="[Valid HTML 4.01 Transitional]"
- title="Valid HTML 4.01 Transitional"
- src="http://www.w3.org/Icons/valid-html401"
- style="border: 0px solid ; width: 88px; height: 31px;"></a> <a
- href="http://www.anybrowser.org/campaign/"><img
- alt="[Use Any Browser Here]" title="Use Any Browser Here"
- src="download/globe_trans.png"
- style="border: 0px solid ; width: 147px; height: 42px;"></a> <img
- style="width: 88px; height: 31px;" alt="[PNG Used Here]"
- title="PNG Used Here" src="download/PNGnow2.png"><br>
-<br>
-Last update 2012-02-21 by <a href="http://www.cs.unibo.it/%7Efguidi/">Ferruccio
-Guidi</a><br>
-</div>
-</body>
+computer
+ math systems</a>.</li>
+ </ul>
+ </li>
+ </ul>
+ <ul>
+ <li><a style=" font-weight: bold;"
+ href="documentation.html#ldp6">Version 0.8.0</a><span
+ style="font-weight: bold;"> (2009-09).</span>
+ Supports
+ "basic_rg" λδ with naive implementation of
+ impredicative sort
+ inclusion. Features
+ importation from <a
+ href="http://www.win.tue.nl/automath/">Automath</a>
+ and exportation to <a href="http://www.w3.org/XML/">XML</a>.
+ [Svn
+ revision: 10304] (<a
+ href="download/helena_0.8.0.tar.gz">archived
+ source code</a>)<br>
+ <ul>
+ <li><span style="font-weight: bold;">2009-09.</span>
+ Jutting's specification of Landau's "<span
+ style="font-style: italic;">Grundlagen
+ der
+ Analysis</span>" enters λδ Digital Library.<br>
+ <span style="font-weight: bold;"></span></li>
+ <li><span style="font-weight: bold;">2009-06.</span>
+ Jutting's specification of Landau's "<span
+ style="font-style: italic;">Grundlagen
+ der
+ Analysis</span>" is
+ successfully processed, enabling sort inclusion<span
+ style="font-weight: bold;"></span>.</li>
+ </ul>
+ </li>
+ </ul>
+ <h3 style="text-align: right;">Other resources <img
+ style="width: 37px; height: 37px;" alt="[Butterfly]"
+ title="Butterfly" src="download/b4.png"></h3>
+ <ul>
+ <li><a name="bibtex"></a>A
+ BibTeX database of λδ documentation: <a
+ href="download/lambda_delta.bib"><span
+ style="font-style: italic;">lambda_delta.bib</span></a>,
+ <a style="font-style: italic;"
+ href="download/lambda_delta.txt">lambda_delta.txt</a>
+ (revised <span style="font-weight: bold;">2011-09</span>).</li>
+ </ul>
+ <ul>
+ <li>A <a href="http://www.jedsoft.org/jed/">Jed mode</a>
+ for
+ editing ".hln" files (containing λδ textual syntax): <a
+ style="font-style: italic;"
+ href="download/helena.sl">helena.sl</a>
+ (revised <span style="font-weight: bold;">2010-11</span>).</li>
+ </ul>
+ <ul>
+ <li>A <a href="http://www.jedsoft.org/jed/">Jed mode</a>
+ for
+ editing ".aut" files (containing <a
+ href="http://www.win.tue.nl/automath/">Automath</a>
+ textual syntax): <a style="font-style: italic;"
+ href="download/automath.sl">automath.sl</a>
+ (revised <span style="font-weight: bold;">2008-07</span>).</li>
+ </ul>
+ <ul>
+ <li>A logo for "basic" λδ: <a href="download/bld.pdf"><span
+ style="font-style: italic;">bld.pdf</span></a>
+ (revised <span style="font-weight: bold;">2008-07</span>).<br>
+ </li>
+ </ul>
+ </td>
+ </tr>
+ </tbody>
+ </table>
+ <br>
+ <a href="http://validator.w3.org/check?uri=referer"><img
+ alt="[Valid HTML 4.01 Transitional]" title="Valid HTML 4.01
+ Transitional" src="http://www.w3.org/Icons/valid-html401"
+ style="border: 0px solid ; width: 88px; height: 31px;"></a> <a
+ href="http://www.anybrowser.org/campaign/"><img alt="[Use Any
+ Browser Here]" title="Use Any Browser Here"
+ src="download/globe_trans.png" style="border: 0px solid ;
+ width: 147px; height: 42px;"></a> <img style="width: 88px;
+ height: 31px;" alt="[PNG Used Here]" title="PNG Used Here"
+ src="download/PNGnow2.png"><br>
+ <br>
+ Last update 2012-02-24 by <a
+ href="http://www.cs.unibo.it/%7Efguidi/">Ferruccio
+ Guidi</a><br>
+ </div>
+ </body>
</html>
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
-<head>
- <meta content="text/html; charset=UTF-8" http-equiv="content-type">
- <title>lambda_delta home page</title>
- <meta content="Ferruccio Guidi" name="author">
- <meta content="The formal system lambda_delta" name="description">
- <link rel="shortcut icon" href="download/crux_16.ico">
-</head>
-<body>
-<div style="text-align: center;">
-<br>
-<a href="http://lambda-delta.info"><img alt="[Crux Logo]"
- title="The Crux" src="download/crux_32.png"
- style="border: 0px solid ; width: 32px; height: 32px;"></a>
-<h1>The Formal System λδ (lambda_delta)<br>
-</h1>
-<h2>Towards the unification of terms, types, environments and contexts</h2>
-<img style="width: 95%; height: 4px;" alt="[Separator]"
- title="Separator" src="download/rainbow.png"><br>
-<table
- style="text-align: left; width: 95%; margin-left: auto; margin-right: auto;"
- border="0" cellpadding="2" cellspacing="20">
- <tbody>
- <tr>
- <td style="vertical-align: top;">
- <ul>
- <li><a href="index.html">Foreword</a></li>
- </ul>
- <ul>
- <li>News</li>
- </ul>
- <ul>
- <li><a href="documentation.html">Papers</a></li>
- </ul>
- <ul>
- <li><a href="implementation.html">Resources</a><br>
- </li>
- </ul>
- </td>
- <td style="vertical-align: top; text-align: left;">
- <h3 style="text-align: right;">News <img
- style="width: 37px; height: 37px;" alt="[Butterfly]" title="Butterfly"
- src="download/b5.png"></h3>
- <ul>
- <li><span style="font-weight: bold;">September 2011.</span> The
-denomination "lambda-delta" changes to "lambda_delta".</li>
- <ul>
- <li>The character "-" is reserved in λδ textual syntax
-(recognized by <span style="font-style: italic;">Helena 0.8.1</span>).<br>
- </li>
- <li>Eventually, the occurrences of the character "-" will be
-replaced by "_" in all λδ-related identifiers.</li>
- <li>In particular, this refactoring involves file names and
-path names.</li>
- <li>The permanent λδ URL is sheduled to become <span
- style="font-style: italic;">http://lambda_delta.info</span> on
-December 2012.<br>
- </li>
- </ul>
- </ul>
- <ul>
- <li><span style="font-weight: bold;">April 2011.</span> The
-specification of λδ version 2 and related topics is restarted in <a
- href="http://matita.cs.unibo.it/">Matita 0.5</a>.</li>
- <ul>
- <li><a href="ld_basic_2.html">Here</a> is a page about the
-specification (Core).<br>
- </li>
- <li><a href="ld_apps_2.html">Here</a> is a page about the
-topics related to the specification (Applications).<br>
- </li>
- </ul>
- </ul>
- <ul>
- <li><span style="font-weight: bold;">December 2010.</span>
-Permanent λδ URL acquired: <a href="http://lambda-delta.info">http://lambda-delta.info</a>
-(pointing at this site). <br>
- <span style="font-weight: bold;"></span></li>
- </ul>
- <ul>
- <li><span style="font-weight: bold;">November 2010.</span> <span
- style="font-style: italic;">Helena 0.8.1</span> is released. <br>
- </li>
- </ul>
- <ul>
- <li><span style="font-weight: bold;">September 2009.</span> <span
- style="font-style: italic;">Helena 0.8.0</span> is released and the <a
- href="implementation.html#lddl">λδ Digital Library</a> is
-started.<br>
- <span style="font-weight: bold;"></span></li>
- </ul>
- <ul>
- <li><span style="font-weight: bold;">June 2009.</span> <span
- style="font-style: italic;">Helena</span>, a <a
- href="implementation.html#helena">validator for λδ version 2</a>, is
-available
-as
-a
-part
-of
-the
-
- <a href="http://helm.cs.unibo.it/">HELM</a> software. <br>
- </li>
- </ul>
- <span style="font-weight: bold;"></span>
- <ul>
- <li><span style="font-weight: bold;">September 2008.</span>
-This site is online.<br>
- </li>
- </ul>
- <span style="font-weight: bold;"></span>
- <ul>
- <li><span style="font-weight: bold;">July 2008.</span> <a
- href="documentation.html#tocl1">First journal paper on λδ</a> accepted
-for publication.</li>
- </ul>
- <ul>
- <li><span style="font-weight: bold;">July 2008.</span> First <a
- href="http://helm.cs.unibo.it/procedural/">procedural
-reconstruction</a> for <a href="http://matita.cs.unibo.it/">Matita 0.5</a>
-of the <a href="implementation.html#source">λδ proof scripts for
-Coq 7.3.1</a>.<br>
- </li>
- </ul>
- <ul>
- <li><span style="font-weight: bold;">June 2008.</span> The <a
- href="implementation.html#static">HTML
-pages of the specification of λδ version 1 for Matita 0.5</a> are
-online.<br>
- <span style="font-weight: bold;"></span></li>
- </ul>
- <ul>
- <li><span style="font-weight: bold;">March 2008.</span> The
-specification of λδ version 2 is started with Coq 7.3.1 (false start).
-<!-- <ul>
+ <head>
+ <meta content="text/html; charset=UTF-8" http-equiv="content-type">
+ <title>lambda_delta home page</title>
+ <meta content="Ferruccio Guidi" name="author">
+ <meta content="The formal system lambda_delta" name="description">
+ <link rel="shortcut icon" href="download/crux_16.ico">
+ </head>
+ <body>
+ <div style="text-align: center;">
+ <br>
+ <a href="http://lambda-delta.info"><img alt="[Crux Logo]"
+ title="The Crux" src="download/crux_32.png" style="border: 0px
+ solid ; width: 32px; height: 32px;"></a>
+ <h1>The Formal System λδ (lambda_delta)<br>
+ </h1>
+ <h2>Towards the unification of terms, types, environments and
+ contexts</h2>
+ <img style="width: 95%; height: 4px;" alt="[Separator]"
+ title="Separator" src="download/rainbow.png"><br>
+ <table style="text-align: left; width: 95%; margin-left: auto;
+ margin-right: auto;" border="0" cellpadding="2" cellspacing="20">
+ <tbody>
+ <tr>
+ <td style="vertical-align: top;">
+ <ul>
+ <li><a href="index.html">Foreword</a></li>
+ </ul>
+ <ul>
+ <li>News</li>
+ </ul>
+ <ul>
+ <li><a href="documentation.html">Papers</a></li>
+ </ul>
+ <ul>
+ <li><a href="implementation.html">Resources</a><br>
+ </li>
+ </ul>
+ </td>
+ <td style="vertical-align: top; text-align: left;">
+ <h3 style="text-align: right;">News <img style="width:
+ 37px; height: 37px;" alt="[Butterfly]"
+ title="Butterfly" src="download/b5.png"></h3>
+ <ul>
+ <li><span style="font-weight: bold;">September 2011.</span>
+ The
+ denomination "lambda-delta" changes to "lambda_delta".</li>
+ <ul>
+ <li>The character "-" is reserved in λδ textual syntax
+ (recognized by <span style="font-style: italic;">Helena
+ 0.8.1</span>).<br>
+ </li>
+ <li>Eventually, the occurrences of the character "-"
+ will be
+ replaced by "_" in all λδ-related identifiers.</li>
+ <li>In particular, this refactoring involves file
+ names and
+ path names.</li>
+ <li>The permanent λδ URL is sheduled to become <span
+ style="font-style: italic;">http://lambda_delta.info</span>
+ on
+ December 2012.<br>
+ </li>
+ </ul>
+ </ul>
+ <ul>
+ <li><span style="font-weight: bold;">April 2011.</span>
+ The
+ specification of λδ version 2 and related topics is
+ restarted in <a href="http://matita.cs.unibo.it/">Matita
+ 0.5</a>.</li>
+ <ul>
+ <li><a href="ld_apps_2.html">Here</a> is a page about
+ the
+ topics related to the specification (Applications).</li>
+ <li><a href="ld_basic_2.html">Here</a> is a page about
+ the
+ specification (Core).<br>
+ </li>
+ </ul>
+ </ul>
+ <ul>
+ <li><span style="font-weight: bold;">December 2010.</span>
+ Permanent λδ URL acquired: <a
+ href="http://lambda-delta.info">http://lambda-delta.info</a>
+ (pointing at this site). <br>
+ <span style="font-weight: bold;"></span></li>
+ </ul>
+ <ul>
+ <li><span style="font-weight: bold;">November 2010.</span>
+ <span style="font-style: italic;">Helena 0.8.1</span>
+ is released. <br>
+ </li>
+ </ul>
+ <ul>
+ <li><span style="font-weight: bold;">September 2009.</span>
+ <span style="font-style: italic;">Helena 0.8.0</span>
+ is released and the <a
+ href="implementation.html#lddl">λδ Digital Library</a>
+ is
+ started.<br>
+ <span style="font-weight: bold;"></span></li>
+ </ul>
+ <ul>
+ <li><span style="font-weight: bold;">June 2009.</span> <span
+ style="font-style: italic;">Helena</span>, a <a
+ href="implementation.html#helena">validator for λδ
+ version 2</a>, is
+ available
+ as
+ a
+ part
+ of
+ the <a href="http://helm.cs.unibo.it/">HELM</a>
+ software. <br>
+ </li>
+ </ul>
+ <span style="font-weight: bold;"></span>
+ <ul>
+ <li><span style="font-weight: bold;">September 2008.</span>
+ This site is online.<br>
+ </li>
+ </ul>
+ <span style="font-weight: bold;"></span>
+ <ul>
+ <li><span style="font-weight: bold;">July 2008.</span> <a
+ href="documentation.html#ldp5">First journal paper
+ on λδ</a> accepted
+ for publication.</li>
+ </ul>
+ <ul>
+ <li><span style="font-weight: bold;">July 2008.</span>
+ First <a href="http://helm.cs.unibo.it/procedural/">procedural
+ reconstruction</a> for <a
+ href="http://matita.cs.unibo.it/">Matita 0.5</a>
+ of the <a href="implementation.html#ldp1">λδ proof
+ scripts for
+ Coq 7.3.1</a>.<br>
+ </li>
+ </ul>
+ <ul>
+ <li><span style="font-weight: bold;">June 2008.</span>
+ The <a href="implementation.html#static">HTML
+ pages of the specification of λδ version 1 for
+ Matita 0.5</a> are
+ online.<br>
+ <span style="font-weight: bold;"></span></li>
+ </ul>
+ <ul>
+ <li><span style="font-weight: bold;">March 2008.</span>
+ The
+ specification of λδ version 2 is started with Coq
+ 7.3.1 (false start).
+ <!-- <ul>
<li>native type assignment with new rules for application: <span
style="font-style: italic;">nty</span> (it replaces <span
style="font-style: italic;">ty3</span>);<br>
style="font-style: italic;">cbk</span>).</li>
</ul>
--> </li>
- </ul>
- <ul>
- <li><span style="font-weight: bold;">September 2007.</span>
-The <a href="implementation.html#dynamic">specification of λδ version
-1 for
-Matita 0.4</a> is online.<br>
- </li>
- </ul>
- <ul>
- <li><span style="font-weight: bold;">December 2005.</span> <a
- href="documentation.html#bologna1">First communication on λδ</a>.<br>
- </li>
- </ul>
- <ul>
- <li><span style="font-weight: bold;">May 2004.</span> The <a
- href="implementation.html#source">specification of λδ version 1</a> is
-started with Coq 7.3.1.<br>
- </li>
- </ul>
- <h3 style="text-align: right;">Visibility <img
- style="width: 37px; height: 37px;" alt="[Butterfly]" title="Butterfly"
- src="download/b4.png"></h3>
- <ul>
- <li><span style="font-weight: bold;">February 2012.</span>
-The <a href="http://www.google.com/">Google</a>
-search for <span style="color: rgb(255, 0, 0);">formal system lambda
-delta</span>
-gives 5 resources about λδ in the first 6 results.<br>
- </li>
- </ul>
- <ul>
- <li><span style="font-weight: bold;">February 2012.</span>
-The <a href="http://www.yahoo.com/">Yahoo</a>
-search <span style="color: rgb(255, 0, 0);">formal system lambda delta</span>
-gives this site as the first result.</li>
- </ul>
- </td>
- </tr>
- </tbody>
-</table>
-<br>
-<a href="http://validator.w3.org/check?uri=referer"><img
- alt="[Valid HTML 4.01 Transitional]"
- title="Valid HTML 4.01 Transitional"
- src="http://www.w3.org/Icons/valid-html401"
- style="border: 0px solid ; width: 88px; height: 31px;"></a> <a
- href="http://www.anybrowser.org/campaign/"><img
- alt="[Use Any Browser Here]" title="Use Any Browser Here"
- src="download/globe_trans.png"
- style="border: 0px solid ; width: 147px; height: 42px;"></a> <img
- style="width: 88px; height: 31px;" alt="[PNG Used Here]"
- title="PNG Used Here" src="download/PNGnow2.png"><br>
-<br>
-Last update 2012-02-24 by <a href="http://www.cs.unibo.it/%7Efguidi/">Ferruccio
-Guidi</a><br>
-</div>
-</body>
+ </ul>
+ <ul>
+ <li><span style="font-weight: bold;">September 2007.</span>
+ The <a href="implementation.html#dynamic">specification
+ of λδ version
+ 1 for
+ Matita 0.4</a> is online.</li>
+ </ul>
+ <ul>
+ <li><span style="font-weight: bold;">November 2006.</span>
+ <a href="documentation.html#ldp3">λδ version
+ 1</a> is released.</li>
+ </ul>
+ <ul>
+ <li><span style="font-weight: bold;">December 2005.</span>
+ <a href="documentation.html#ldt1">First communication
+ on λδ</a>.<br>
+ </li>
+ </ul>
+ <ul>
+ <li><span style="font-weight: bold;">May 2004.</span>
+ The <a href="implementation.html#ldp1">specification
+ of λδ version 1</a> is
+ started with Coq 7.3.1.<br>
+ </li>
+ </ul>
+ <h3 style="text-align: right;">Visibility <img
+ style="width: 37px; height: 37px;" alt="[Butterfly]"
+ title="Butterfly" src="download/b4.png"></h3>
+ <ul>
+ <li><span style="font-weight: bold;">February 2012.</span>
+ The <a href="http://www.google.com/">Google</a>
+ search for <span style="color: rgb(255, 0, 0);">formal
+ system lambda
+ delta</span>
+ gives 5 resources about λδ in the first 6 results.<br>
+ </li>
+ </ul>
+ <ul>
+ <li><span style="font-weight: bold;">February 2012.</span>
+ The <a href="http://www.yahoo.com/">Yahoo</a>
+ search <span style="color: rgb(255, 0, 0);">formal
+ system lambda delta</span>
+ gives this site as the first result.</li>
+ </ul>
+ </td>
+ </tr>
+ </tbody>
+ </table>
+ <br>
+ <a href="http://validator.w3.org/check?uri=referer"><img
+ alt="[Valid HTML 4.01 Transitional]" title="Valid HTML 4.01
+ Transitional" src="http://www.w3.org/Icons/valid-html401"
+ style="border: 0px solid ; width: 88px; height: 31px;"></a> <a
+ href="http://www.anybrowser.org/campaign/"><img alt="[Use Any
+ Browser Here]" title="Use Any Browser Here"
+ src="download/globe_trans.png" style="border: 0px solid ;
+ width: 147px; height: 42px;"></a> <img style="width: 88px;
+ height: 31px;" alt="[PNG Used Here]" title="PNG Used Here"
+ src="download/PNGnow2.png"><br>
+ <br>
+ Last update 2012-02-24 by <a
+ href="http://www.cs.unibo.it/%7Efguidi/">Ferruccio
+ Guidi</a><br>
+ </div>
+ </body>
</html>
projects / helm.git / commitdiff