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-<html xmlns="http://www.w3.org/1999/xhtml" xmlns:ld="http://lambdadelta.info/" 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 class="spacer"><br/></div><div 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 class="head2dx" id="milestones">Milestones <img class="icon37" alt="[butterfly]" title="\lambda\delta butterfly" src="http://lambdadelta.info/images/b3.png"/></div><ul><li><span class="emph alpha">December 2015.</span><a href="http://lambdadelta.info/documentation.html#ldJ3a">Second journal paper on λδ</a>
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+ <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>
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+ <a href="http://lambdadelta.info/home.html">home</a>
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+ <a href="http://lambdadelta.info/news.html">news</a>
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+ </td>
+ <td class="snnn capitalize italic white">
+ <br />
+ </td>
+ <td class="snnn capitalize italic white">
+ <br />
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+ <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">
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+ <a href="http://lambdadelta.info/home.html#foreword">foreword</a>
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+ <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="milestones">Milestones <img class="icon37" alt="[butterfly]" title="\lambda\delta butterfly" src="http://lambdadelta.info/images/b3.png" />
+ </div>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph alpha">December 2015.</span>
+ <a href="http://lambdadelta.info/documentation.html#ldJ3a">Second journal paper on λδ</a>
accepted for publication.
- </li></ul><ul><li><span class="emph gamma">December 2015.</span><a href="http://lambdadelta.info/implementation.html#v3">"Helena 0.8.3"</a> is released.
- </li></ul><ul><li><span class="emph delta">August 2015.</span>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph gamma">December 2015.</span>
+ <a href="http://lambdadelta.info/implementation.html#v3">"Helena 0.8.3"</a> is released.
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph delta">August 2015.</span>
The specification of λδ version 2A1 is concluded.
- </li></ul><ul><li><span class="emph gamma">June 2015.</span>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph gamma">June 2015.</span>
The corrected specification of Landau's "Grundlagen der Analysis"
is validated in a λProlog implementation of λδ version 3.
- </li></ul><ul><li><span class="emph delta">March 2015.</span>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph delta">March 2015.</span>
The specification of λδ version 1 is validated by
<a href="http://matita.cs.unibo.it/">Matita 0.99.2</a>.
- </li></ul><ul><li><span class="emph gamma">February 2015.</span><a href="http://lambdadelta.info/implementation.html#v2">"Helena 0.8.2"</a> is updated.
- <ul><li class="">
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph gamma">February 2015.</span>
+ <a href="http://lambdadelta.info/implementation.html#v2">"Helena 0.8.2"</a> is updated.
+ <ul>
+ <li class="">
The translated specification of Landau's "Grundlagen der Analysis"
is validated in CC by <a href="http://coq.inria.fr/">Coq 8.4.3</a>.
- </li></ul></li></ul><ul><li><span class="emph delta">January 2015.</span>
+ </li>
+ </ul>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph delta">January 2015.</span>
The specification of <a href="http://lambdadelta.info/specification.html#v1">λδ version 1</a>
is updated with backports from the abandoned specification of λδ version 2.
- </li></ul><ul><li><span class="emph gamma">December 2014.</span><a href="http://lambdadelta.info/implementation.html#v2">"Helena 0.8.2"</a> is released.
- <ul><li class="">
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph gamma">December 2014.</span>
+ <a href="http://lambdadelta.info/implementation.html#v2">"Helena 0.8.2"</a> is released.
+ <ul>
+ <li class="">
The corrected specification of Landau's "Grundlagen der Analysis"
is validated in λδ version 3.
- </li></ul></li></ul><ul><li><span class="emph gamma">October 2014.</span><a href="http://lambdadelta.info/documentation.html#ldJ2a">λδ version 2A1</a>
+ </li>
+ </ul>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph gamma">October 2014.</span>
+ <a href="http://lambdadelta.info/documentation.html#ldJ2a">λδ version 2A1</a>
is released.
- </li></ul><ul><li><span class="emph beta">July 2014.</span>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph beta">July 2014.</span>
A new version of this site is online.
- </li></ul><ul><li><span class="emph beta">June 2014.</span><a href="http://lambdadelta.info/documentation.html#ldP2c">First communication on λδ version 2.</a></li></ul><ul><li><span class="emph alpha">December 2012.</span>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph beta">June 2014.</span>
+ <a href="http://lambdadelta.info/documentation.html#ldP2c">First communication on λδ version 2.</a>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph alpha">December 2012.</span>
The character "_" is removed from the denomination "lambda_delta":
- <ul><li class="">
+ <ul>
+ <li class="">
The denomination "\lambda\delta" is used in λδ-related texts.
- </li><li class="">
+ </li>
+ <li class="">
The denomination "lambdadelta" is used in λδ-related identifiers.
- </li><li class="">
+ </li>
+ <li class="">
Permanent λδ URL acquired:
<a href="http://lambdadelta.info/">http://lambdadelta.info/</a>
(pointing at this site).
- </li></ul></li></ul><ul><li><span class="emph alpha">September 2011.</span>
+ </li>
+ </ul>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph alpha">September 2011.</span>
The denomination "lambda-delta" changes to "lambda_delta":
- <ul><li class="">
+ <ul>
+ <li class="">
The character "-" is reserved in λδ textual syntax
(recognized by "Helena 0.8.1").
- </li><li class="">
+ </li>
+ <li class="">
Eventually, the occurrences of the character "-"
will be replaced by "_" in all λδ-related identifiers.
- </li><li class="">
+ </li>
+ <li class="">
In particular, this refactoring involves file names and path names.
- </li></ul></li></ul><ul><li><span class="emph alpha">April 2011.</span>
+ </li>
+ </ul>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph alpha">April 2011.</span>
The specification of <a href="http://lambdadelta.info/specification.html#v2">λδ version 2</a>
and related topics is restarted in
<a href="http://matita.cs.unibo.it/">Matita 0.5</a>.
- </li></ul><ul><li><span class="emph delta">February 2011.</span>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph delta">February 2011.</span>
The specification of λδ version 2 with Coq 7.3.1 is abandoned.
- </li></ul><ul><li><span class="emph alpha">December 2010.</span>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph alpha">December 2010.</span>
Transient λδ URL acquired: http://lambda-delta.info/ (expires on December 2012).
- </li></ul><ul><li><span class="emph beta">November 2010.</span><a href="http://lambdadelta.info/implementation.html#v1">"Helena 0.8.1"</a> is released.
- </li></ul><ul><li><span class="emph beta">September 2009.</span><a href="http://lambdadelta.info/implementation.html#v0">"Helena 0.8.0"</a> is released and the
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph beta">November 2010.</span>
+ <a href="http://lambdadelta.info/implementation.html#v1">"Helena 0.8.1"</a> is released.
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph beta">September 2009.</span>
+ <a href="http://lambdadelta.info/implementation.html#v0">"Helena 0.8.0"</a> is released and the
<a href="http://lambdadelta.info/implementation.html#lddl">λδ Digital Library</a> is started.
- </li></ul><ul><li><span class="emph alpha">June 2009.</span>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph alpha">June 2009.</span>
"Helena", a <a href="http://lambdadelta.info/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.
- </li></ul><ul><li><span class="emph alpha">September 2008.</span>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph alpha">September 2008.</span>
This site is online.
- </li></ul><ul><li><span class="emph delta">July 2008.</span><a href="http://lambdadelta.info/documentation.html#ldJ1a">First journal paper on λδ</a>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph delta">July 2008.</span>
+ <a href="http://lambdadelta.info/documentation.html#ldJ1a">First journal paper on λδ</a>
accepted for publication.
- </li></ul><ul><li><span class="emph delta">July 2008.</span>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph delta">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 λδ version 1 for Coq 7.3.1.
- </li></ul><ul><li><span class="emph delta">June 2008.</span>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph delta">June 2008.</span>
The <a href="http://lambdadelta.info/specification.html#static1">
HTML pages of the specification of λδ version 1 for Matita 0.5</a>
are online.
- </li></ul><ul><li><span class="emph delta">May 2008.</span>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph delta">May 2008.</span>
The specification of λδ version 1 is concluded.
- </li></ul><ul><li><span class="emph alpha">March 2008.</span>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph alpha">March 2008.</span>
The specification of λδ version 2 is started with Coq 7.3.1 (false start).
- </li></ul><ul><li><span class="emph gamma">September 2007.</span>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph gamma">September 2007.</span>
The <a href="http://lambdadelta.info/specification.html#dynamic1">
specification of λδ version 1 for Matita 0.4</a>
is online.
- </li></ul><ul><li><span class="emph gamma">November 2006.</span><a href="http://lambdadelta.info/documentation.html#ldR1b">λδ version 1</a>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph gamma">November 2006.</span>
+ <a href="http://lambdadelta.info/documentation.html#ldR1b">λδ version 1</a>
is released.
- </li></ul><ul><li><span class="emph beta">December 2005.</span><a href="http://lambdadelta.info/documentation.html#ldP1a">First communication on λδ version 1</a>.
- </li></ul><ul><li><span class="emph alpha">May 2004.</span>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph beta">December 2005.</span>
+ <a href="http://lambdadelta.info/documentation.html#ldP1a">First communication on λδ version 1</a>.
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph alpha">May 2004.</span>
The specification of <a href="http://lambdadelta.info/specification.html#v1">λδ version 1</a>
is started with Coq 7.3.1.
- </li></ul><!-- ===================================================================== --><div class="head2dx" id="visibility">Visibility <img class="icon37" alt="[butterfly]" title="\lambda\delta butterfly" src="http://lambdadelta.info/images/b3.png"/></div><ul><li><span class="emph alpha">June 2014.</span>
+ </li>
+ </ul>
+ <!-- ===================================================================== -->
+ <div xmlns:ld="http://lambdadelta.info/" class="head2dx" id="visibility">Visibility <img class="icon37" alt="[butterfly]" title="\lambda\delta butterfly" src="http://lambdadelta.info/images/b3.png" />
+ </div>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph alpha">June 2014.</span>
The <a href="http://www.google.com/">Google</a>
search for "formal system lambda delta" gives
5 resources about the λδ family in the first 6 results.
- </li></ul><ul><li><span class="emph alpha">June 2014.</span>
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph alpha">June 2014.</span>
The <a href="http://www.yahoo.com/">Yahoo</a>
search for "formal system lambda delta" gives
4 resources about the λδ family in the first 5 results.
- </li></ul><div class="spacer"><img class="rule" alt="[Spacer]" title="\lambda\delta rainbow rule" src="http://lambdadelta.info/images/rainbow.png"/></div><div class="spacer"><br/></div><div 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 class="spacer"><br/></div><div class="spacer">Last update: Thu, 09 Mar 2017 13:38:15 +0100</div></body></html>
+ </li>
+ </ul>
+ <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>
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projects / helm.git / blobdiff