+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph alpha">April 2011.</span>
+ The specification of <a href="http://lambdadelta.info/version_2.html">λδ version 2</a>
+ and related topics is restarted in
+ <a href="http://matita.cs.unibo.it/">Matita 0.5</a>.
+ </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 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 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 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 xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph alpha">September 2008.</span>
+ This site is online.
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph delta">July 2008.</span>
+ <a href="http://lambdadelta.info/documentation.html#ldJ1">First journal paper on λδ</a>
+ accepted for publication.
+ </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 xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph delta">June 2008.</span>
+ The <a href="http://lambdadelta.info/version_1.html#static">
+ HTML pages of the specification of λδ version 1 for Matita 0.5</a>
+ are online.
+ </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 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 xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph gamma">September 2007.</span>
+ The <a href="http://lambdadelta.info/version_1.html#dynamic">
+ specification of λδ version 1 for Matita 0.4</a>
+ is online.
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph gamma">November 2006.</span>
+ <a href="http://lambdadelta.info/documentation.html#ldR2">λδ version 1</a>
+ is released.
+ </li>
+ </ul>
+ <ul xmlns:ld="http://lambdadelta.info/">
+ <li>
+ <span class="emph beta">December 2005.</span>
+ <a href="http://lambdadelta.info/documentation.html#ldP1">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/version_1.html">λδ version 1</a>
+ is started with Coq 7.3.1.
+ </li>
+ </ul>
+ <!-- ===================================================================== -->
+ <div xmlns:ld="http://lambdadelta.info/" class="head2dx" id="visibility">Visibility <img class="icon37" alt="[spacer]" title="lambdadelta butterfly" src="http://lambdadelta.info/images/b3.png" />