</td>
<td class="snns capitalize magenta">
<a href="http://lambdadelta.info/news.html#milestones">milestones</a>
</td>
<td class="snns capitalize magenta">
<a href="http://lambdadelta.info/news.html#milestones">milestones</a>
<a href="http://lambdadelta.info/documentation.html#v2">version 2</a>
</td>
<td class="snns capitalize green">
<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>
+ <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>
<td class="snss capitalize magenta">
<a href="http://lambdadelta.info/news.html#visibility">visibility</a>
</td>
<td class="snss capitalize magenta">
<a href="http://lambdadelta.info/news.html#visibility">visibility</a>
<a href="http://lambdadelta.info/documentation.html#v1">version 1</a>
</td>
<td class="snss capitalize green">
<a href="http://lambdadelta.info/documentation.html#v1">version 1</a>
</td>
<td class="snss capitalize green">
</div>
<div xmlns:ld="http://lambdadelta.info/" class="text">
The systems of the λδ family are developed as machine-checked digital specifications,
</div>
<div xmlns:ld="http://lambdadelta.info/" class="text">
The systems of the λδ family are developed as machine-checked digital specifications,
<tr>
<td class="snns top capitalize italic gray">version</td>
<td class="snnn top capitalize italic gray">name</td>
<tr>
<td class="snns top capitalize italic gray">version</td>
<td class="snnn top capitalize italic gray">name</td>
<td class="snnn top capitalize italic gray">started</td>
<td class="snnn top capitalize italic gray">announced</td>
<td class="snnn top capitalize italic gray">released</td>
<td class="snnn top capitalize italic gray">started</td>
<td class="snnn top capitalize italic gray">announced</td>
<td class="snnn top capitalize italic gray">released</td>
<td class="snnn top yellow" />
<td class="snnn top yellow" />
<td class="ssnn top yellow">
<td class="snnn top yellow" />
<td class="snnn top yellow" />
<td class="ssnn top yellow">
<a href="http://lambdadelta.info/specification.html#v2">Version 2</a>
</td>
<td class="snnn top orange">"basic_2"</td>
<a href="http://lambdadelta.info/specification.html#v2">Version 2</a>
</td>
<td class="snnn top orange">"basic_2"</td>
<td class="snnn top orange">October 2015</td>
<td class="snnn top orange" />
<td class="snnn top orange" />
<td class="snnn top orange" />
<td class="snnn top orange">October 2015</td>
<td class="snnn top orange" />
<td class="snnn top orange" />
<td class="snnn top orange" />
<td class="snnn top orange">April 2011</td>
<td class="snnn top orange">June 2014</td>
<td class="snnn top orange">October 2014</td>
<td class="snnn top orange">August 2015</td>
<td class="ssnn top orange">
<td class="snnn top orange">April 2011</td>
<td class="snnn top orange">June 2014</td>
<td class="snnn top orange">October 2014</td>
<td class="snnn top orange">August 2015</td>
<td class="ssnn top orange">
- <a href="http://lambdadelta.info/documentation#ldV2a">V2a</a>
- <a href="http://lambdadelta.info/documentation#ldR2c">R2c</a>
+ <a href="http://lambdadelta.info/documentation.html#ldV2a">V2a</a>
+ <a href="http://lambdadelta.info/documentation.html#ldR2c">R2c</a>
<td class="snnn top orange">March 2008</td>
<td class="snnn top orange" />
<td class="snnn top orange" />
<td class="snnn top orange">February 2011</td>
<td class="snnn top orange">March 2008</td>
<td class="snnn top orange" />
<td class="snnn top orange" />
<td class="snnn top orange">February 2011</td>
</tr>
<tr>
<td class="snss top red">
<a href="http://lambdadelta.info/specification.html#v1">Version 1</a>
</td>
<td class="snsn top red">"basic_1"</td>
</tr>
<tr>
<td class="snss top red">
<a href="http://lambdadelta.info/specification.html#v1">Version 1</a>
</td>
<td class="snsn top red">"basic_1"</td>
<td class="snsn top red">May 2004</td>
<td class="snsn top red">December 2005</td>
<td class="snsn top red">November 2006</td>
<td class="snsn top red">May 2008</td>
<td class="sssn top red">
<td class="snsn top red">May 2004</td>
<td class="snsn top red">December 2005</td>
<td class="snsn top red">November 2006</td>
<td class="snsn top red">May 2008</td>
<td class="sssn top red">
- <a href="http://lambdadelta.info/documentation#ldV1a">V1a</a>
- <a href="http://lambdadelta.info/documentation#ldJ1a">J1a</a>
+ <a href="http://lambdadelta.info/documentation.html#ldV1a">V1a</a>
+ <a href="http://lambdadelta.info/documentation.html#ldJ1a">J1a</a>
</ul>
<!-- VERSION 3 =========================================================== -->
<div xmlns:ld="http://lambdadelta.info/" class="head3sn" id="v3">
</ul>
<!-- VERSION 3 =========================================================== -->
<div xmlns:ld="http://lambdadelta.info/" class="head3sn" id="v3">
<div xmlns:ld="http://lambdadelta.info/" class="text">
The formal specification of λδ version 3
is forthcoming.
</div>
<!-- VERSION 2 =========================================================== -->
<div xmlns:ld="http://lambdadelta.info/" class="head3sn" id="v2">
<div xmlns:ld="http://lambdadelta.info/" class="text">
The formal specification of λδ version 3
is forthcoming.
</div>
<!-- VERSION 2 =========================================================== -->
<div xmlns:ld="http://lambdadelta.info/" class="head3sn" id="v2">
<div xmlns:ld="http://lambdadelta.info/" class="text">
The formal specification of λδ version 2
is available in the following formats:
<div xmlns:ld="http://lambdadelta.info/" class="text">
The formal specification of λδ version 2
is available in the following formats:
<div class="text">
<a href="http://lambdadelta.info/download/lambdadelta_2A1.tar.gz">lambdadelta_2A1 for Matita 0.99.2</a>
(revised <span class="emph gamma">2014-10</span>).
<div class="text">
<a href="http://lambdadelta.info/download/lambdadelta_2A1.tar.gz">lambdadelta_2A1 for Matita 0.99.2</a>
(revised <span class="emph gamma">2014-10</span>).
</div>
<!-- VERSION 1 =========================================================== -->
<div xmlns:ld="http://lambdadelta.info/" class="head3sn" id="v1">
</div>
<!-- VERSION 1 =========================================================== -->
<div xmlns:ld="http://lambdadelta.info/" class="head3sn" id="v1">
<div xmlns:ld="http://lambdadelta.info/" class="text">
The formal specification of λδ version 1
is available in the following formats:
<div xmlns:ld="http://lambdadelta.info/" class="text">
The formal specification of λδ version 1
is available in the following formats:
<span class="emph delta">2015 January 15.</span>
17 new lemmas and former lemma "eq_nat_dec" renamed as "nat_dec_neg".
</li>
<span class="emph delta">2015 January 15.</span>
17 new lemmas and former lemma "eq_nat_dec" renamed as "nat_dec_neg".
</li>
(revised <span class="emph delta">2011-09</span>).
Static HTML pages generated by the <a href="http://helm.cs.unibo.it/">HELM</a> rendering engine.
<ul>
(revised <span class="emph delta">2011-09</span>).
Static HTML pages generated by the <a href="http://helm.cs.unibo.it/">HELM</a> rendering engine.
<ul>
<a href="http://lambdadelta.info/static/matita/lambdadelta/basic_1/pr3/pr3/pr3_confluence.con.html">
Confluence of reduction</a>
(Church-Rosser property).
</li>
<a href="http://lambdadelta.info/static/matita/lambdadelta/basic_1/pr3/pr3/pr3_confluence.con.html">
Confluence of reduction</a>
(Church-Rosser property).
</li>
<a href="http://lambdadelta.info/static/matita/lambdadelta/basic_1/ty3/props/ty3_correct.con.html">
Correctness of types</a>.
</li>
<a href="http://lambdadelta.info/static/matita/lambdadelta/basic_1/ty3/props/ty3_correct.con.html">
Correctness of types</a>.
</li>
<a href="http://lambdadelta.info/static/matita/lambdadelta/basic_1/ty3/props/ty3_unique.con.html">
Uniqueness of types up to conversion</a>.
</li>
<a href="http://lambdadelta.info/static/matita/lambdadelta/basic_1/ty3/props/ty3_unique.con.html">
Uniqueness of types up to conversion</a>.
</li>
<a href="http://lambdadelta.info/static/matita/lambdadelta/basic_1/ty3/pr3/ty3_sred_pr3.con.html">
Subject reduction of the type assignment</a>.
</li>
<a href="http://lambdadelta.info/static/matita/lambdadelta/basic_1/ty3/pr3/ty3_sred_pr3.con.html">
Subject reduction of the type assignment</a>.
</li>
<a href="http://lambdadelta.info/static/matita/lambdadelta/basic_1/ty3/arity_props/ty3_sn3.con.html">
Strong normalization of the typed terms</a>.
</li>
<a href="http://lambdadelta.info/static/matita/lambdadelta/basic_1/ty3/arity_props/ty3_sn3.con.html">
Strong normalization of the typed terms</a>.
</li>
<a href="http://lambdadelta.info/static/matita/lambdadelta/basic_1/ty3/dec/ty3_inference.con.html">
Decidability of the type inference problem</a>.
</li>
<a href="http://lambdadelta.info/static/matita/lambdadelta/basic_1/ty3/dec/ty3_inference.con.html">
Decidability of the type inference problem</a>.
</li>