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-<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="[lambdadelta home]" title="lambdadelta 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="lambdadelta 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 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="images/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/lambdadelta/">lambdadelta</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/lambdadelta/Basic_1/pr3/pr3/pr3_confluence.con.html">Confluence
-                        of
-                        reduction</a> (Church-Rosser property).</li>
-                    <li><a href="static/matita/lambdadelta/Basic_1/ty3/props/ty3_correct.con.html">Correctness
-                        of
-                        types</a>.</li>
-                    <li><a href="static/matita/lambdadelta/Basic_1/ty3/props/ty3_unique.con.html">Uniqueness
-                        of
-                        types
-                        up
-                        to
-                        conversion</a>.<br>
-                    </li>
-                    <li><a href="static/matita/lambdadelta/Basic_1/ty3/pr3/ty3_sred_pr3.con.html">Subject
-                        reduction
-                        of
-                        the
-                        type
-                        assignment</a>.</li>
-                    <li><a href="static/matita/lambdadelta/Basic_1/ty3/arity_props/ty3_sn3.con.html">Strong
-                        normalization
-                        of
-                        the
-                        typed
-                        terms</a>.</li>
-                    <li><a href="static/matita/lambdadelta/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&amp;xmluri=http://helm.cs.unibo.it/helm//html/folder/index.html&amp;prop.media-type=text/html&amp;param.thmedia-type=text/html&amp;param.thkeys=T1%2CT2%2CL%2CE&amp;param.embedkeys=d_c%2CTC1%2CHC2%2CL&amp;param.thencoding=UTF-8&amp;prop.encoding=UTF-8&amp;prop.doctype-public=-//W3C//DTD%20XHTML%201.0%20Transitional//EN&amp;param.doctype-public=-//W3C//DTD%20XHTML%201.0%20Transitional//EN&amp;param.encoding=UTF-8&amp;param.media-type=text/html&amp;param.keys=d_c%2CC1%2CHC2%2CL&amp;profile=default&amp;param.profile=default&amp;param.CICURI=theory:/matita/lambdadelta/">lambdadelta</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/lambdadelta_1.tar.gz"><span style="font-style: italic;">lambdadelta_1</span></a>
-                  (revised <span style="font-weight: bold;">2012-10</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="images/b5.png"></h3>
-              <a name="lddl"></a><img style="width: 32px; height: 32px;" alt="[Crux Logo]" title="The Crux" src="images/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;">2012-10</span>), <a href="download/lddl.tar.bz2">data set</a> (updated <span style="font-weight: bold;">2012-10</span>), <a href="http://lambdadelta.info/xml/">HELM server URL</a>
-                  (updated <span style="font-weight: bold;">2012-10</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="images/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&amp;path=%2Ftrunk%2Fhelm%2Fsoftware%2Fhelena%2F&amp;rev=0&amp;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&nbsp; Helena are indicated below. <br>
-              <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&nbsp;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#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="images/b4.png"></h3>
-              <ul>
-                <li><a name="bibtex"></a>A
-                  BibTeX database of λδ documentation: <a href="download/lambdadelta.bib"><span style="font-style: italic;">lambdadelta.bib</span></a>,
-                  <a style="font-style: italic;" href="download/lambdadelta.txt">lambdadelta.txt</a>
-                  (revised <span style="font-weight: bold;">2012-10</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 λδ: <a href="images/crux_177.png"><span style="font-style: italic;">crux_177.png</span></a>
-                  (revised <span style="font-weight: bold;">2012-09</span>).<br>
-                </li>
-              </ul>
+            <td class="snns capitalize italic sky">
+              <a href="http://lambdadelta.info/index.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/index.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#lddl">library</a>
+            </td>
+            <td class="ssnn capitalize green">(<a href="http://lambdadelta.info/static/lddl/">static LDDL directory</a>)</td>
+          </tr>
+          <tr>
+            <td class="snss capitalize sky">
+              <a href="http://lambdadelta.info/index.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#helena">helena</a>
+            </td>
+            <td class="sssn capitalize green">
+              <br />
             </td>
           </tr>
         </tbody>
       </table>
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-          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="images/PNGnow2.png"><br>
-      <br>
-      Last update 2012-12-02 by <a href="http://www.cs.unibo.it/%7Efguidi/">Ferruccio
-        Guidi</a><br>
     </div>
-  
-</body></html>
+    <div xmlns:ld="http://lambdadelta.info/" class="head2dx" id="tools">Tools <img class="icon37" alt="[spacer]" title="lambdadelta butterfly" src="http://lambdadelta.info/images/b5.png" />
+    </div>
+    <div xmlns:ld="http://lambdadelta.info/" class="head3sn" id="lddl">
+      <img class="icon32" alt="[Crux logo]" title="the Crux" src="http://lambdadelta.info/images/crux_32.png" /> λδ Digital Library (LDDL)</div>
+    <div xmlns:ld="http://lambdadelta.info/" class="text">
+      The λδ Digital Library is part of <a href="http://helm.cs.unibo.it/">HELM</a>
+      and contains resources expressed in the systems of the λδ family.      
+   </div>
+    <ul xmlns:ld="http://lambdadelta.info/" id="contents">
+      <li>
+        <span class="emph alpha">Contents:</span>
+      Landau's "Grundlagen der Analysis"
+      (from Jutting's specification in  <a href="http://www.win.tue.nl/automath/">Automath</a>).
+   </li>
+    </ul>
+    <ul xmlns:ld="http://lambdadelta.info/" id="access">
+      <li>
+        <span class="emph alpha">Access:</span>
+        <a href="http://lambdadelta.info/static/lddl/">static pages</a> (updated <span class="emph gamma">2015-01</span>),
+      <a href="http://lambdadelta.info/download/lddl.tar.bz2">data set</a> (updated <span class="emph gamma">2014-12</span>),
+      <a href="http://lambdadelta.info/xml/">HELM server URL</a> (updated <span class="emph gamma">2014-12</span>).
+   </li>
+    </ul>
+    <ul xmlns:ld="http://lambdadelta.info/" id="examples">
+      <li>
+        <span class="emph alpha">Examples:</span>
+        <a href="http://lambdadelta.info/static/lddl/Environment/grundlagen_2/l/e/st/eq/landau/n/rt/rp/r/c/8283/t234.ld.html">
+         Grundlagen's definition "t234"</a>
+      in λδ version 4.
+   </li>
+    </ul>
+    <div xmlns:ld="http://lambdadelta.info/" class="head3sn" id="helena">
+      <img class="icon32" alt="[Helena logo]" title="Helena" src="http://lambdadelta.info/images/helena_32.png" /> Helena</div>
+    <div xmlns:ld="http://lambdadelta.info/" class="text">
+      Helena is a processor for the systems of the λδ family,
+      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 both their stable and unstable features.
+   </div>
+    <div xmlns:ld="http://lambdadelta.info/" class="text">
+      The processor source code is available in the directory
+      <a href="http://helm.cs.unibo.it/websvn/listing.php?repname=helm&amp;path=%2Ftrunk%2Fhelm%2Fsoftware%2Fhelena%2F&amp;rev=0&amp;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 next.
+   </div>
+    <ul xmlns:ld="http://lambdadelta.info/" id="v3">
+      <li>
+        <span class="emph gamma">Version 0.8.3 (2015-12).</span>
+      Supports exportation to λProlog
+      (two formats for ELPI,
+      and two formats for <a href="http://teyjus.cs.umn.edu/">Teyjus</a>).
+      Employs optimized conditional compilation through
+      <a href="http://camlp5.gforge.inria.fr/">camlp5</a> code preprocessor (pa_macro)
+      to reduce a performance loss, which is expected to disappear
+      by employing a different code preprocessor.
+      Overall validation speed of the "Grundlagen der Analysis" with respect to version 0.8.2:
+      +3% with optimized compilation, +5% without optimized compilation.
+      [Svn revision: 13108] (<a href="http://lambdadelta.info/download/helena_0.8.3.tar.gz">archived source code</a>).
+      <ul>
+          <li>
+            <span class="emph gamma">2015-06.</span>
+         The corrected specification of Landau's "Grundlagen der Analysis"
+         is successfully validated in a λProlog implementation of λδ version 3.
+      </li>
+        </ul>
+      </li>
+    </ul>
+    <ul xmlns:ld="http://lambdadelta.info/" id="v2">
+      <li>
+        <span class="emph gamma">Version 0.8.2 (2015-02).</span>
+      Uses λδ version 3 with layer variables as core language.
+      Supports exportation to Gallina
+      (the specification language of <a href="http://coq.inria.fr/">Coq</a>),
+      and to Grafite
+      (the specification language of <a href="http://matita.cs.unibo.it/">Matita</a>).
+      The overall validation speed of the "Grundlagen der Analysis"
+      increases of 34% with respect to version 0.8.1.
+      <a href="http://lambdadelta.info/documentation.html#ldJ3a">Documentation (J3a)</a>.
+      [Svn revision: 13035] (<a href="http://lambdadelta.info/download/helena_0.8.2.tar.gz">archived source code</a>).
+      <ul>
+          <li>
+         The specification of Landau's "Grundlagen der Analysis"
+         for <a href="http://coq.inria.fr/">Coq 8</a>:
+         <a href="http://lambdadelta.info/download/grundlagen_2.v">grundlagen_2.v</a>
+         (revised <span class="emph gamma">2015-02</span>).
+      </li>
+          <li>
+         The specification of Landau's "Grundlagen der Analysis"
+         for <a href="http://matita.cs.unibo.it/">Matita 0.99.2</a>:
+         <a href="http://lambdadelta.info/download/grundlagen_2.tar.bz2">grundlagen_2.tar.bz2</a>
+         (revised <span class="emph gamma">2015-02</span>).
+      </li>
+          <li>
+         The corrected specification of Landau's "Grundlagen der Analysis":  
+         <a href="http://lambdadelta.info/download/grundlagen_2.aut">grundlagen_2.aut</a>
+         (revised <span class="emph gamma">2014-12</span>).
+      </li>
+          <li>
+            <span class="emph gamma">2015-02.</span>
+         The translated specification of Landau's "Grundlagen der Analysis"
+         is successfully validated in CC by <a href="http://coq.inria.fr/">Coq 8.4.3</a>.
+      </li>
+          <li>
+            <span class="emph gamma">2014-12.</span>
+         The corrected specification of Landau's "Grundlagen der Analysis"
+         is successfully validated in λδ version 3.
+      </li>
+        </ul>
+      </li>
+    </ul>
+    <ul xmlns:ld="http://lambdadelta.info/" id="v1">
+      <li>
+        <span class="emph beta">Version 0.8.1 (2010-11).</span>
+      Uses a subset of λδ version 4 as intermediate language.
+      Features importation from ".hln" files containing λδ textual syntax.
+      The overall validation speed of the "Grundlagen der Analysis"
+      increases of 22% with respect to version 0.8.0.
+      [Svn revision: 11032] (<a href="http://lambdadelta.info/download/helena_0.8.1.tar.gz">archived source code</a>).
+      <ul>
+          <li>
+         A <a href="http://www.jedsoft.org/jed/">Jed mode</a>
+         for editing ".hln" files (containing λδ textual syntax):
+         <a href="http://lambdadelta.info/download/helena.sl">helena.sl</a>
+         (revised <span class="emph alpha">2010-11</span>).
+      </li>
+          <li>
+            <span class="emph beta">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 xmlns:ld="http://lambdadelta.info/" id="v0">
+      <li>
+        <span class="emph beta">Version 0.8.0 (2009-09).</span>
+      Supports λδ version 2 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>.
+      <a href="http://lambdadelta.info/documentation.html#ldR2a">Documentation (R2a)</a>.
+      [Svn revision: 10304] (<a href="http://lambdadelta.info/download/helena_0.8.0.tar.gz">archived source code</a>).
+      <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 href="http://lambdadelta.info/download/automath.sl">automath.sl</a>
+         (revised <span class="emph gamma">2008-07</span>).
+      </li>
+          <li>
+            <span class="emph beta">2009-09.</span>
+         Jutting's specification of Landau's "Grundlagen der Analysis"
+         enters λδ Digital Library.
+      </li>
+          <li>
+            <span class="emph beta">2009-06.</span>
+         Jutting's specification of Landau's "Grundlagen der Analysis"
+         is successfully processed, enabling sort inclusion.
+      </li>
+        </ul>
+      </li>
+    </ul>
+    <div class="spacer">
+      <img class="rule" alt="[Spacer]" title="lambdadelta 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: Sat, 23 Jan 2016 00:45:18 +0100</div>
+  </body>
+</html>