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-<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
-<html dir="ltr" lang="en-us"><head>
-
-  
-    <meta content="text/html; charset=UTF-8" http-equiv="content-type"><title>λδ home page</title>
-    
-    <meta content="Ferruccio Guidi" name="author">
-    <meta content="The formal system λδ" name="description">
-    <link rel="shortcut icon" href="images/crux_16.ico"></head><body>
-    <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 (\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="images/rainbow.png"><br>
-      <table style="text-align: left; width: 95%; margin-left: auto; margin-right: auto;" border="0" cellpadding="2" cellspacing="20">
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" dir="ltr" lang="en-us">
+  <head>
+    <meta http-equiv="Content-Language" content="en-us" />
+    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+    <meta http-equiv="Content-Style-Type" content="text/css" />
+    <meta name="author" content="Ferruccio Guidi" />
+    <meta name="description" content="\lambda\delta home page" />
+    <title>\lambda\delta home page</title>
+    <link rel="stylesheet" type="text/css" href="http://lambdadelta.info/css/ld_web.css" />
+    <link rel="stylesheet" type="text/css" href="http://lambdadelta.info/css/lddl.css" />
+    <link rel="stylesheet" type="text/css" href="http://lambdadelta.info/css/xhtbl.css" />
+    <link rel="shortcut icon" href="http://lambdadelta.info/images/crux_16.ico" />
+  </head>
+  <body lang="en-US">
+    <div class="spacer">
+      <a href="http://lambdadelta.info/">
+        <img class="icon32" alt="[\lambda\delta home]" title="\lambda\delta home" src="http://lambdadelta.info/images/crux_32.png" />
+      </a>
+    </div>
+    <div class="head1">The Formal Systems of the λδ (\lambda\delta) Family</div>
+    <div class="spacer">
+      <img class="rule" alt="[Spacer]" title="\lambda\delta rainbow rule" src="http://lambdadelta.info/images/rainbow.png" />
+    </div>
+    <div xmlns:ld="http://lambdadelta.info/" class="spacer">
+      <br />
+    </div>
+    <div xmlns:ld="http://lambdadelta.info/" class="text">
+      <table cellpadding="4" cellspacing="0">
+        <tbody>
+          <tr>
+            <td class="snns capitalize italic sky">
+              <a href="http://lambdadelta.info/home.html">home</a>
+            </td>
+            <td class="snns capitalize italic magenta">
+              <a href="http://lambdadelta.info/news.html">news</a>
+            </td>
+            <td class="snns capitalize italic white">
+              <a href="http://lambdadelta.info/specification.html">specification</a>
+            </td>
+            <td class="snnn capitalize italic white">
+              <br />
+            </td>
+            <td class="snnn capitalize italic white">
+              <br />
+            </td>
+            <td class="snns capitalize italic orange">
+              <a href="http://lambdadelta.info/documentation.html">documentation</a>
+            </td>
+            <td class="snns capitalize italic green">
+              <a href="http://lambdadelta.info/implementation.html">implementation</a>
+            </td>
+            <td class="ssnn capitalize italic green">
+              <br />
+            </td>
+          </tr>
+          <tr>
+            <td class="snns capitalize sky">
+              <a href="http://lambdadelta.info/home.html#foreword">foreword</a>
+            </td>
+            <td class="snns capitalize magenta">
+              <a href="http://lambdadelta.info/news.html#milestones">milestones</a>
+            </td>
+            <td class="snns capitalize white">
+              <a href="http://lambdadelta.info/specification.html#v2">version 2</a>
+            </td>
+            <td class="snnn capitalize white">(<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="snnn capitalize white">
+              <br />
+            </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/implementation.html#helena">helena</a>
+            </td>
+            <td class="ssnn capitalize green">
+              <a href="http://lambdadelta.info/osn/">Open Symbolic Notation (OSN)</a>
+            </td>
+          </tr>
+          <tr>
+            <td class="snss capitalize sky">
+              <a href="http://lambdadelta.info/home.html#citations">citations</a>
+            </td>
+            <td class="snss capitalize magenta">
+              <a href="http://lambdadelta.info/news.html#visibility">visibility</a>
+            </td>
+            <td class="snss capitalize white">
+              <a href="http://lambdadelta.info/specification.html#v1">version 1</a>
+            </td>
+            <td class="snsn capitalize white">(<a href="http://lambdadelta.info/ground_1.html">background</a> - <a href="http://lambdadelta.info/basic_1.html">core</a>)</td>
+            <td class="snsn capitalize white">(<a href="http://lambdadelta.info/static/matita/lambdadelta/">static HELM directory</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/implementation.html#lddl">library</a>
+            </td>
+            <td class="sssn capitalize green">(<a href="http://lambdadelta.info/static/lddl/">static LDDL directory</a>)</td>
+          </tr>
+        </tbody>
+      </table>
+    </div>
+    <div xmlns:ld="http://lambdadelta.info/" class="head2dx" id="bibtex">Documentation <img class="icon37" alt="[butterfly]" title="\lambda\delta butterfly" src="http://lambdadelta.info/images/b4.png" />
+    </div>
+    <div xmlns:ld="http://lambdadelta.info/" class="text">
+      BibTeX database of λδ documentation:
+      <span class="emph alpha">download</span>
+      <a href="http://lambdadelta.info/download/lambdadelta.bib">lambdadelta.bib</a>,
+      <span class="emph alpha">view</span>
+      <a href="http://lambdadelta.info/download/lambdadelta.txt">lambdadelta.txt</a>
+      (revised <span class="emph gamma">2017-09</span>).
+   </div>
+    <div xmlns:ld="http://lambdadelta.info/" class="head3sn" id="v3">
+      <img class="icon37" alt="[butterfly]" title="\lambda\delta butterfly" src="http://lambdadelta.info/images/b8.png" /> λδ version 3 (proposed)</div>
+    <div xmlns:ld="http://lambdadelta.info/" class="text">
+      The main source of information is <span class="emph alpha">J3a</span>.
+   </div>
+    <div xmlns:ld="http://lambdadelta.info/" class="text">
+      <table cellpadding="4" cellspacing="0">
         <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="images/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
-                  lambdadelta Logo]" title="Basic lambdadelta" src="images/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;"><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
-                  lambdadelta Logo]" title="Basic lambdadelta" src="images/basic_32.png"> Basic λδ version 1
-                (dismissed):</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 lambdadelta</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 class="snns top" id="ldJ3a">
+              <span class="emph alpha">J3a.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://jfr.unibo.it/article/view/4716">Verified Representations of Landau's "Grundlagen" in the λδ Family and in the Calculus of Constructions</a> (<span class="emph alpha">2015-12</span>). In JFR 8(1), Univerity of Bologna, pp. 93-116. <a href="http://lambdadelta.info/documentation.html#bibtex">BibTeX entry</a>.</td>
+          </tr>
+          <tr>
+            <td class="nnss top" />
+            <td class="nssn top">
+              <br />
             </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="images/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="http://www.cs.unibo.it/%7Efguidi/images/PNGnow2.png"><br>
-      <br>
-      Last update 2012-12-01 by <a href="http://www.cs.unibo.it/%7Efguidi/">Ferruccio
-        Guidi</a><br>
     </div>
-  
-</body></html>
\ No newline at end of file
+    <div xmlns:ld="http://lambdadelta.info/" class="head3sn" id="v2">
+      <img class="icon37" alt="[butterfly]" title="\lambda\delta butterfly" src="http://lambdadelta.info/images/b4.png" /> λδ version 2 (active)</div>
+    <div xmlns:ld="http://lambdadelta.info/" class="text">
+      The main source of information is <span class="emph alpha">R2c</span>.
+   </div>
+    <div xmlns:ld="http://lambdadelta.info/" class="text">
+      <table cellpadding="4" cellspacing="0">
+        <tbody>
+          <tr>
+            <td class="snns top" id="ldR2c">
+              <span class="emph alpha">R2c.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://amsacta.unibo.it/4411/">Extending the Applicability Condition in the Formal System λδ</a> (<span class="emph gamma">2015-03</span>). University of Bologna, technical report AMS Acta 4411. <a href="http://lambdadelta.info/documentation.html#bibtex">BibTeX entry</a>.</td>
+          </tr>
+          <tr>
+            <td class="nnns top" />
+            <td class="nsnn top">
+              <br />
+            </td>
+          </tr>
+          <tr>
+            <td class="snns top" id="ldR2b">
+              <span class="emph alpha">R2b.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://lambdadelta.info/download/cie_2010.pdf">An Efficient Validation Procedure for the Formal System λδ</a> (<span class="emph alpha">2010-07</span>). In CiE 2010 Local Proceedings. University of Azores, CMATI Booklet, pp. 204-213. <a href="http://lambdadelta.info/documentation.html#bibtex">BibTeX entry</a>.</td>
+          </tr>
+          <tr>
+            <td class="nnns top" />
+            <td class="nsnn top">
+              <br />
+            </td>
+          </tr>
+          <tr>
+            <td class="snns top" id="ldR2a">
+              <span class="emph alpha">R2a.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://www.informatica.unibo.it/it/ricerca/technical-report/2009/UBLCS-2009-16">Landau's "Grundlagen der Analysis" from Automath to lambda-delta</a> (<span class="emph alpha">2009-09</span>). University of Bologna, technical report UBLCS-2009-16. <a href="http://lambdadelta.info/documentation.html#bibtex">BibTeX entry</a>.</td>
+          </tr>
+          <tr>
+            <td class="nnns top" />
+            <td class="nsnn top">
+              <br />
+            </td>
+          </tr>
+          <tr>
+            <td class="snns top" id="ldP2d">
+              <span class="emph alpha">P2d.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://lambdadelta.info/download/ld_talk_9s.pdf">Considerations on Automath in Light of the Grundlagen</a> (revised <span class="emph gamma">2016-06</span>). Presentation at University of Bologna (slides).</td>
+          </tr>
+          <tr>
+            <td class="nnns top" />
+            <td class="nsnn top">
+              <br />
+            </td>
+          </tr>
+          <tr>
+            <td class="snns top" id="ldP2c">
+              <span class="emph alpha">P2c.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://lambdadelta.info/download/ld_talk_8s.pdf">The Formal System λδ and the "Three Problems"</a> (<span class="emph beta">2014-06</span>). Presentation at University of Bologna, for the 10th anniversary of λδ (slides).</td>
+          </tr>
+          <tr>
+            <td class="nnns top" />
+            <td class="nsnn top">
+              <br />
+            </td>
+          </tr>
+          <tr>
+            <td class="snns top" id="ldP2b">
+              <span class="emph alpha">P2b.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://lambdadelta.info/download/ld_talk_7s.pdf">An Efficient Validation Procedure for the Formal System λδ</a> (<span class="emph alpha">2010-07</span>). Presentation at CiE 2010 (slides).</td>
+          </tr>
+          <tr>
+            <td class="nnns top" />
+            <td class="nsnn top">
+              <br />
+            </td>
+          </tr>
+          <tr>
+            <td class="snns top" id="ldP2a">
+              <span class="emph alpha">P2a.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://lambdadelta.info/download/ld_talk_6s.pdf">A Validator for the Formal System λδ</a> (revised <span class="emph alpha">2010-02</span>). Presentation at University of Bologna (slides).</td>
+          </tr>
+          <tr>
+            <td class="nnns top" />
+            <td class="nsnn top">
+              <br />
+            </td>
+          </tr>
+          <tr>
+            <td class="snns top" id="ldV2a">
+              <span class="emph alpha">V2a.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://lambdadelta.info/version_2.html">lambdadelta_2A1</a> (revised <span class="emph gamma">2014-10</span>). Formal specification for the proof assistant Matita 0.99.2 (scripts). <a href="http://lambdadelta.info/documentation.html#bibtex">BibTeX entry</a>.</td>
+          </tr>
+          <tr>
+            <td class="nnss top" />
+            <td class="nssn top">
+              <br />
+            </td>
+          </tr>
+        </tbody>
+      </table>
+    </div>
+    <div xmlns:ld="http://lambdadelta.info/" class="head3sn" id="v1">
+      <img class="icon37" alt="[butterfly]" title="\lambda\delta butterfly" src="http://lambdadelta.info/images/b6.png" /> λδ version 1 (superseded)</div>
+    <div xmlns:ld="http://lambdadelta.info/" class="text">
+      The main source of information is <span class="emph alpha">J1a</span>.
+      A summary is available in <span class="emph alpha">P1e</span>.
+   </div>
+    <div xmlns:ld="http://lambdadelta.info/" class="text">
+      <table cellpadding="4" cellspacing="0">
+        <tbody>
+          <tr>
+            <td class="snns top" id="ldJ1a">
+              <span class="emph alpha">J1a.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://doi.acm.org/10.1145/1614431.1614436">The Formal System λδ</a> (<span class="emph delta">2009-11</span>). In ACM ToCL 11(1), pp. 5:1-5:37 online app. pp. 1-11 (<a href="http://tocl.acm.org/accepted/335guidi.pdf">accepted</a>
+              <span class="emph delta">2008-07</span>). CoRR identifier <a href="http://arxiv.org/abs/cs/0611040">cs/0611040</a> [v10] (revised <span class="emph delta">2008-09</span>). <a href="http://lambdadelta.info/documentation.html#bibtex">BibTeX entry</a>.</td>
+          </tr>
+          <tr>
+            <td class="nnns top" />
+            <td class="nsnn top">
+              <br />
+            </td>
+          </tr>
+          <tr>
+            <td class="snns top" id="ldR1c">
+              <span class="emph alpha">R1c.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://lambdadelta.info/download/cie_2007.pdf">Lambda Types on the Lambda Calculus with Abbreviations</a> (<span class="emph delta">2007-06</span>). In CiE 2007 Local Proceedings. University of Siena, technical report 487, p. 387 (abstract of a presentation). <a href="http://lambdadelta.info/documentation.html#bibtex">BibTeX entry</a>.</td>
+          </tr>
+          <tr>
+            <td class="nnns top" />
+            <td class="nsnn top">
+              <br />
+            </td>
+          </tr>
+          <tr>
+            <td class="snns top" id="ldR1b">
+              <span class="emph alpha">R1b.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://www.informatica.unibo.it/it/ricerca/technical-report/2006/UBLCS-2006-25">Lambda Types on the Lambda Calculus with Abbreviations</a> (<span class="emph gamma">2006-11</span>). University of Bologna, technical report UBLCS-2006-25. <a href="http://lambdadelta.info/documentation.html#bibtex">BibTeX entry</a>.</td>
+          </tr>
+          <tr>
+            <td class="nnns top" />
+            <td class="nsnn top">
+              <br />
+            </td>
+          </tr>
+          <tr>
+            <td class="snns top" id="ldR1a">
+              <span class="emph alpha">R1a.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://www.informatica.unibo.it/it/ricerca/technical-report/2006/UBLCS-2006-01">Lambda Types on the Lambda Calculus with Abbreviations: a Certified Specification</a> (<span class="emph beta">2006-01</span>). University of Bologna, technical report UBLCS-2006-01. <a href="http://lambdadelta.info/documentation.html#bibtex">BibTeX entry</a>.</td>
+          </tr>
+          <tr>
+            <td class="nnns top" />
+            <td class="nsnn top">
+              <br />
+            </td>
+          </tr>
+          <tr>
+            <td class="snns top" id="ldP1e">
+              <span class="emph alpha">P1e.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://lambdadelta.info/download/ld_talk_5s.pdf">The Formal System λδ</a> (<span class="emph delta">2008-10</span>). Presentation at Advances in Constructive Topology and Logical Foundations (slides).</td>
+          </tr>
+          <tr>
+            <td class="nnns top" />
+            <td class="nsnn top">
+              <br />
+            </td>
+          </tr>
+          <tr>
+            <td class="snns top" id="ldP1d">
+              <span class="emph alpha">P1d.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://lambdadelta.info/download/ld_talk_4s.pdf">Towards the Unification of Terms, Types and Contexts</a> (<span class="emph gamma">2008-03</span>). Presentation at Types 2008 (slides).</td>
+          </tr>
+          <tr>
+            <td class="nnns top" />
+            <td class="nsnn top">
+              <br />
+            </td>
+          </tr>
+          <tr>
+            <td class="snns top" id="ldP1c">
+              <span class="emph alpha">P1c.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://lambdadelta.info/download/ld_talk_3s.pdf">Lambda Types on the Lambda Calculus with Abbreviations</a> (<span class="emph gamma">2007-06</span>). Presentation at CiE 2007 (slides).</td>
+          </tr>
+          <tr>
+            <td class="nnns top" />
+            <td class="nsnn top">
+              <br />
+            </td>
+          </tr>
+          <tr>
+            <td class="snns top" id="ldP1b">
+              <span class="emph alpha">P1b.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://lambdadelta.info/download/ld_talk_2s.pdf">Lambda Tipi sul Lambda Calcolo con Abbreviazioni</a> (<span class="emph gamma">2007-01</span>). Presentation at University of Padova (slides <span class="emph alpha">in Italian</span>).</td>
+          </tr>
+          <tr>
+            <td class="nnns top" />
+            <td class="nsnn top">
+              <br />
+            </td>
+          </tr>
+          <tr>
+            <td class="snns top" id="ldP1a">
+              <span class="emph alpha">P1a.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://lambdadelta.info/download/ld_talk_1s.pdf">Lambda Tipi sul Lambda Calcolo con Abbreviazioni: una Specifica Certificata</a> (<span class="emph beta">2005-12</span>). Presentation at University of Bologna (slides <span class="emph alpha">in Italian</span>).</td>
+          </tr>
+          <tr>
+            <td class="nnns top" />
+            <td class="nsnn top">
+              <br />
+            </td>
+          </tr>
+          <tr>
+            <td class="snns top" id="ldV1a">
+              <span class="emph alpha">V1a.</span>
+            </td>
+            <td class="ssnn top">F. Guidi: <a href="http://lambdadelta.info/version_1.html">lambdadelta_1</a> (revised <span class="emph delta">2015-01</span>). Formal specification for the proof assistant Coq 7.3.1 (scripts). <a href="http://lambdadelta.info/documentation.html#bibtex">BibTeX entry</a>.</td>
+          </tr>
+          <tr>
+            <td class="nnss top" />
+            <td class="nssn top">
+              <br />
+            </td>
+          </tr>
+        </tbody>
+      </table>
+    </div>
+    <div class="spacer">
+      <img class="rule" alt="[Spacer]" title="\lambda\delta rainbow rule" src="http://lambdadelta.info/images/rainbow.png" />
+    </div>
+    <div xmlns:ld="http://lambdadelta.info/" class="spacer">
+      <br />
+    </div>
+    <div xmlns:ld="http://lambdadelta.info/" class="spacer">
+      <a href="http://validator.w3.org/check?uri=referer">
+        <img class="w3c" alt="[Valid XHTML 1.1]" title="Valid XHTML 1.1" src="http://www.w3.org/Icons/valid-xhtml11-blue" />
+      </a>
+      <a href="http://jigsaw.w3.org/css-validator/check/referer">
+        <img class="w3c" alt="[Valid CSS level 2]" title="Valid CSS level 2" src="http://www.w3.org/Icons/valid-css2-blue" />
+      </a>
+      <a href="http://www.w3.org/XML/">
+        <img class="w3c" alt="[Generated from XML via XSL]" title="Generated from XML via XSL" src="http://lambdadelta.info/images/xml_xsl2.png" />
+      </a>
+      <a href="http://www.w3.org/Graphics/PNG/">
+        <img class="w3c" alt="[PNG used here]" title="PNG used here" src="http://lambdadelta.info/images/PNGnow2.png" />
+      </a>
+      <a href="http://www.anybrowser.org/campaign/">
+        <img class="w3c" alt="[Viewable with any browser]" title="Viewable with any browser" src="http://www.anybrowser.org/campaign/bvgraphics/abtfile.png" />
+      </a>
+    </div>
+    <div xmlns:ld="http://lambdadelta.info/" class="spacer">
+      <br />
+    </div>
+    <div xmlns:ld="http://lambdadelta.info/" class="spacer">Last update: Fri, 24 Nov 2017 21:00:00 +0100</div>
+  </body>
+</html>