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+ <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 lambdadelta" name="description">
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+ <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 (lambdadelta)<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">
+<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>
</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>
+ <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;">December 2012.</span> The character "_" is removed from the denomination "lambda_delta". <br>
+ </li>
+ <ul>
+ <li>The denomination "\lambda\delta" is used in λδ-related texts.</li>
+ <li>The denomination "lambdadelta" is used in λδ-related identifiers.</li>
+ <li>Permanent λδ URL acquired: <a href="http://lambdadelta.info/">http://lambdadelta.info/</a>
+(pointing at this site). </li>
+ </ul>
+</ul>
<ul>
<li><span style="font-weight: bold;">September 2011.</span> The
-denomination "lambdadelta" changes to "lambdadelta".
+denomination "lambda-delta" changes to "lambda_delta".
<ul>
<li>The character "-" is reserved in λδ textual syntax
(recognized by <span style="font-style: italic;">Helena 0.8.1</span>).
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>.
+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>
+ <li><a href="ground_2.html">Here</a> is a page about the
+background of the specification (Ground).</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>
+ <li><span style="font-weight: bold;">December 2010.</span> Transient λδ URL acquired: http://lambda-delta.info/
+(expires on December 2012). <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><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>
+ <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
+ <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;">July 2008.</span> <a
- href="documentation.html#ldp5">First journal paper on λδ</a> accepted
+ <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><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
+ <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>
+specification of λδ version 1 is dismissed.<br>
<span style="font-weight: bold;"></span></li>
</ul>
<ul>
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>
+ <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><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
+ <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="images/b4.png"></h3>
+ <h3 style="text-align: right;">Visibility <img style="width: 37px; height: 37px;" alt="[Butterfly]" title="Butterfly" src="images/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
+ <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
+ <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>
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<br>
-Last update 201
2-12-01 by <a href="http://www.cs.unibo.it/%7Efguidi/">Ferruccio
+Last update 201
3-10-27 by <a href="http://www.cs.unibo.it/%7Efguidi/">Ferruccio
Guidi</a><br>
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projects / helm.git / blobdiff