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 <section3 name="milestones">Milestones</section3>
12 <news date="July 2014.">
13 A new version of this site is online.
16 <news date="June 2014.">
17 <rlink to="documentation.html#ldP8">First communication on λδ version 2.</rlink>
20 <news date="December 2012.">
21 The character "_" is removed from the denomination "lambda_delta":
23 The denomination "\lambda\delta" is used in λδ-related texts.
25 The denomination "lambdadelta" is used in λδ-related identifiers.
27 Permanent λδ URL acquired:
28 <rlink to="">http://lambdadelta.info/</rlink>
29 (pointing at this site).
33 <news date="September 2011.">
34 The denomination "lambda-delta" changes to "lambda_delta":
36 The character "-" is reserved in λδ textual syntax
37 (recognized by "Helena 0.8.1").
39 Eventually, the occurrences of the character "-"
40 will be replaced by "_" in all λδ-related identifiers.
42 In particular, this refactoring involves file names and path names.
46 <news date="April 2011.">
47 The specification of <rlink to="version_2.html">λδ version 2</rlink>
48 and related topics is restarted in
49 <link to="http://matita.cs.unibo.it/">Matita 0.5</link>.
52 <news date="December 2010.">
53 Transient λδ URL acquired: http://lambda-delta.info/ (expires on December 2012).
56 <news date="November 2010.">
57 "Helena 0.8.1" is released.
60 <news date="September 2009.">
61 "Helena 0.8.0" is released and the
62 <rlink to="implementation.html#lddl">λδ Digital Library</rlink>
66 <news date="June 2009.">
67 "Helena", a <rlink to="implementation.html#helena">validator for λδ version 2</rlink>,
68 is available as a part of the <link to="http://helm.cs.unibo.it/">HELM</link> software.
71 <news date="September 2008.">
75 <news date="July 2008.">
76 <rlink to="documentation.html#ldJ1">First journal paper on λδ</rlink>
77 accepted for publication.
80 <news date="July 2008.">
81 First <link to="http://helm.cs.unibo.it/procedural/">procedural reconstruction</link>
82 for <link to="http://matita.cs.unibo.it/">Matita 0.5</link>
83 of the λδ version 1 for Coq 7.3.1.
86 <news date="June 2008.">
87 The <rlink to="version_1.html#static">
88 HTML pages of the specification of λδ version 1 for Matita 0.5</rlink>
92 <news date="May 2008.">
93 The specification of λδ version 1 is dismissed.
96 <news date="March 2008.">
97 The specification of λδ version 2 is started with Coq 7.3.1 (false start).
100 <news date="September 2007.">
101 The <rlink to="version_1.html#dynamic">
102 specification of λδ version 1 for Matita 0.4</rlink>
106 <news date="November 2006.">
107 <rlink to="documentation.html#ldR2">λδ version 1</rlink>
111 <news date="December 2005.">
112 <rlink to="documentation.html#ldP1">First communication on λδ version 1</rlink>.
115 <news date="May 2004.">
116 The specification of <rlink to="version_1.html">λδ version 1</rlink>
117 is started with Coq 7.3.1.
120 <section3 name="visibility">Visibility</section3>
122 <news date="June 2014.">
123 The <link to="http://www.google.com/">Google</link>
124 search for "formal system lambda delta" gives
125 5 resources about λδ in the first 6 results.
128 <news date="June 2014.">
129 The <link to="http://www.yahoo.com/">Yahoo</link>
130 search for "formal system lambda delta" gives
131 4 resources about λδ in the first 5 results.