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- <title>lambdadelta home page</title>
- <meta content="Ferruccio Guidi" name="author">
- <meta content="The formal system lambdadelta" name="description">
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-<div style="text-align: center;"> <br>
-<a href="http://lambdadelta.info"><img alt="[Crux Logo]"
- title="The Crux" src="images/crux_32.png"
- style="border: 0px solid ; width: 32px; height: 32px;"></a>
-<h1>The Formal System λδ (lambdadelta)<br>
-</h1>
-<h2>Towards the unification of terms, types, environments and contexts</h2>
-<img style="width: 95%; height: 4px;" alt="[Separator]"
- title="Separator" src="images/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="images/b5.png"></h3>
- <ul>
- <li><span style="font-weight: bold;">September 2011.</span> The
-denomination "lambdadelta" changes to "lambdadelta".
- <ul>
- <li>The character "-" is reserved in λδ textual syntax
-(recognized by <span style="font-style: italic;">Helena 0.8.1</span>).
- </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://lambdadelta.info</span> on
-December 2012.<br>
- </li>
- </ul>
- </li>
- </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>.
- <ul>
- <li><a href="apps_2.html">Here</a> is a page about the
-topics related to the specification (Applications).</li>
- <li><a href="basic_2.html">Here</a> is a page about the
-specification (Core). </li>
- </ul>
- </li>
- </ul>
- <ul>
- <li><span style="font-weight: bold;">December 2010.</span>
-Permanent λδ URL acquired: <a href="http://lambdadelta.info">http://lambdadelta.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;">May 2008.</span> The
-specification of λδ version 1 is closed.<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). </li>
- </ul>
-<!-- <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>
- </li>
- <li>parallel conversion on focalized terms: <span
- style="font-style: italic;">fpcs</span> (it replaces <span
- style="font-style: italic;"></span><span style="font-style: italic;">pc3</span>);
- <br>
- </li>
- <li>new weak parallel reduction on environments: <span
- style="font-style: italic;">wcpr</span> <span
- style="font-style: italic;"></span>(it is based on <span
- style="font-style: italic;">fpr</span> and replaces <span
- style="font-style: italic;">wcpr0</span>); <br>
- </li>
- <li>parallel reduction on focalized terms: <span
- style="font-style: italic;">fpr</span> and <span
- style="font-style: italic;">fprs</span> (they replace <span
- style="font-style: italic;"></span><span style="font-style: italic;"></span><span
- style="font-style: italic;">pr2</span>, <span
- style="font-style: italic;">pr3</span>); <br>
- </li>
- </ul>
- <ul>
- <li>new thinning relation: <span
- style="font-style: italic;">drop</span>
-(it replaces the old <span style="font-style: italic;">drop</span>, <span
- style="font-style: italic;">clear</span>, <span
- style="font-style: italic;">getl</span>, <span
- style="font-style: italic;">cimp</span>, <span
- style="font-style: italic;">drop1</span>);</li>
- <li>new shift function: <span style="font-style: italic;">shift</span>:
-(it
-replaces
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+ <div class="head1">The Formal System λδ (\lambda\delta)</div>
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+ <a href="http://lambdadelta.info/news.html">news</a>
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+ <a href="http://lambdadelta.info/documentation.html">documentation</a>
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+ <td class="snns capitalize italic green">
+ <a href="http://lambdadelta.info/specification.html">specification</a>
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+ <br />
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+ <td class="ssns capitalize italic green">
+ <a href="http://lambdadelta.info/implementation.html">implementation</a>
+ </td>
+ </tr>
+ <tr>
+ <td class="snns capitalize sky">
+ <a href="http://lambdadelta.info/index.html#foreword">foreword</a>
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+ <td class="snns capitalize magenta">
+ <a href="http://lambdadelta.info/news.html#milestones">milestones</a>
+ </td>
+ <td class="snns capitalize orange">
+ <a href="http://lambdadelta.info/documentation.html#v2">version 2</a>
+ </td>
+ <td class="snns capitalize green">
+ <a href="http://lambdadelta.info/specification.html#v2">version 2</a>
+ </td>
+ <td class="snnn capitalize green">(<a href="http://lambdadelta.info/ground_2.html">background</a> - <a href="http://lambdadelta.info/basic_2.html">core</a> - <a href="http://lambdadelta.info/apps_2.html">applications</a>)</td>
+ <td class="ssns capitalize green">
+ <a href="http://lambdadelta.info/implementation.html#lddl">library</a>
+ </td>
+ </tr>
+ <tr>
+ <td class="snss capitalize sky">
+ <a href="http://lambdadelta.info/index.html#notice">notice</a>
+ </td>
+ <td class="snss capitalize magenta">
+ <a href="http://lambdadelta.info/news.html#visibility">visibility</a>
+ </td>
+ <td class="snss capitalize orange">
+ <a href="http://lambdadelta.info/documentation.html#v1">version 1</a>
+ </td>
+ <td class="snss capitalize green">
+ <a href="http://lambdadelta.info/specification.html#v1">version 1</a>
+ </td>
+ <td class="snsn capitalize green">
+ <br />
+ </td>
+ <td class="ssss capitalize green">
+ <a href="http://lambdadelta.info/implementation.html#helena">helena</a>
+ </td>
+ </tr>
+ </tbody>
+ </table>
+ </div>