1 <?xml version="1.0" encoding="UTF-8"?>
3 <page xmlns="http://lambdadelta.info/"
4 description = "\lambda\delta home page"
5 title = "\lambda\delta home page"
6 head = "The Formal System λδ (\lambda\delta)"
8 <sitemap name="sitemap"/>
10 <!-- ===================================================================== -->
12 <section3 name="milestones">Milestones</section3>
14 <news class="gamma" date="December 2014.">
15 <rlink to="implementation.html#v2">"Helena 0.8.2"</rlink> is released.
17 The corrected specification of Landau's "Grundlagen der Analysis"
18 is validated in λδ version 3.
22 <news class="gamma" date="October 2014.">
23 <rlink to="documentation.html#ldJ2">λδ version 2A</rlink>
27 <news class="beta" date="July 2014.">
28 A new version of this site is online.
31 <news class="beta" date="June 2014.">
32 <rlink to="documentation.html#ldP8">First communication on λδ version 2.</rlink>
35 <news class="alpha" date="December 2012.">
36 The character "_" is removed from the denomination "lambda_delta":
38 The denomination "\lambda\delta" is used in λδ-related texts.
40 The denomination "lambdadelta" is used in λδ-related identifiers.
42 Permanent λδ URL acquired:
43 <rlink to="">http://lambdadelta.info/</rlink>
44 (pointing at this site).
48 <news class="alpha" date="September 2011.">
49 The denomination "lambda-delta" changes to "lambda_delta":
51 The character "-" is reserved in λδ textual syntax
52 (recognized by "Helena 0.8.1").
54 Eventually, the occurrences of the character "-"
55 will be replaced by "_" in all λδ-related identifiers.
57 In particular, this refactoring involves file names and path names.
61 <news class="alpha" date="April 2011.">
62 The specification of <rlink to="version_2.html">λδ version 2</rlink>
63 and related topics is restarted in
64 <link to="http://matita.cs.unibo.it/">Matita 0.5</link>.
67 <news class="delta" date="February 2011.">
68 The specification of λδ version 2 with Coq 7.3.1 is abandoned.
71 <news class="alpha" date="December 2010.">
72 Transient λδ URL acquired: http://lambda-delta.info/ (expires on December 2012).
75 <news class="beta" date="November 2010.">
76 <rlink to="implementation.html#v1">"Helena 0.8.1"</rlink> is released.
79 <news class="beta" date="September 2009.">
80 <rlink to="implementation.html#v0">"Helena 0.8.0"</rlink> is released and the
81 <rlink to="implementation.html#lddl">λδ Digital Library</rlink> is started.
84 <news class="alpha" date="June 2009.">
85 "Helena", a <rlink to="implementation.html#helena">validator for λδ version 2</rlink>,
86 is available as a part of the <link to="http://helm.cs.unibo.it/">HELM</link> software.
89 <news class="alpha" date="September 2008.">
93 <news class="delta" date="July 2008.">
94 <rlink to="documentation.html#ldJ1">First journal paper on λδ</rlink>
95 accepted for publication.
98 <news class="delta" date="July 2008.">
99 First <link to="http://helm.cs.unibo.it/procedural/">procedural reconstruction</link>
100 for <link to="http://matita.cs.unibo.it/">Matita 0.5</link>
101 of the λδ version 1 for Coq 7.3.1.
104 <news class="delta" date="June 2008.">
105 The <rlink to="version_1.html#static">
106 HTML pages of the specification of λδ version 1 for Matita 0.5</rlink>
110 <news class="delta" date="May 2008.">
111 The specification of λδ version 1 is concluded.
114 <news class="alpha" date="March 2008.">
115 The specification of λδ version 2 is started with Coq 7.3.1 (false start).
118 <news class="gamma" date="September 2007.">
119 The <rlink to="version_1.html#dynamic">
120 specification of λδ version 1 for Matita 0.4</rlink>
124 <news class="gamma" date="November 2006.">
125 <rlink to="documentation.html#ldR2">λδ version 1</rlink>
129 <news class="beta" date="December 2005.">
130 <rlink to="documentation.html#ldP1">First communication on λδ version 1</rlink>.
133 <news class="alpha" date="May 2004.">
134 The specification of <rlink to="version_1.html">λδ version 1</rlink>
135 is started with Coq 7.3.1.
138 <!-- ===================================================================== -->
140 <section3 name="visibility">Visibility</section3>
142 <news class="alpha" date="June 2014.">
143 The <link to="http://www.google.com/">Google</link>
144 search for "formal system lambda delta" gives
145 5 resources about λδ in the first 6 results.
148 <news class="alpha" date="June 2014.">
149 The <link to="http://www.yahoo.com/">Yahoo</link>
150 search for "formal system lambda delta" gives
151 4 resources about λδ in the first 5 results.