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 <section5 name="milestones">Milestones</section5>
12 <news date="June 2014.">
13 <rlink to="documentation.html#ldt8">First communication on λδ version 2.</rlink>
15 <news date="December 2012.">
16 The character "_" is removed from the denomination "lambda_delta":
19 The denomination "\lambda\delta" is used in λδ-related texts.
22 The denomination "lambdadelta" is used in λδ-related identifiers.
25 Permanent λδ URL acquired:
26 <rlink to="">http://lambdadelta.info/</rlink>
27 (pointing at this site).
31 <news date="September 2011.">
32 The denomination "lambda-delta" changes to "lambda_delta":
35 The character "-" is reserved in λδ textual syntax
36 (recognized by "Helena 0.8.1").
39 Eventually, the occurrences of the character "-"
40 will be replaced by "_" in all λδ-related identifiers.
43 In particular, this refactoring involves file names and path names.
47 <news date="April 2011.">
48 The specification of <rlink to="version_2.html">λδ version 2</rlink>
49 and related topics is restarted in
50 <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).
55 <news date="November 2010.">
56 "Helena 0.8.1" is released.
58 <news date="September 2009.">
59 "Helena 0.8.0" is released and the
60 <rlink to="implementation.html#lddl">λδ Digital Library</rlink>
63 <news date="June 2009.">
64 "Helena", a <rlink to="implementation.html#helena">validator for λδ version 2</rlink>,
65 is available as a part of the <link to="http://helm.cs.unibo.it/">HELM</link> software.
67 <news date="September 2008.">
70 <news date="July 2008.">
71 <rlink to="documentation.html#ldp5">First journal paper on λδ</rlink>
72 accepted for publication.
74 <news date="July 2008.">
75 First <link to="http://helm.cs.unibo.it/procedural/">procedural reconstruction</link>
76 for <link to="http://matita.cs.unibo.it/">Matita 0.5</link>
77 of the λδ version 1 for Coq 7.3.1.
79 <news date="June 2008.">
80 The <rlink to="version_1.html#static">
81 HTML pages of the specification of λδ version 1 for Matita 0.5</rlink>
84 <news date="May 2008.">
85 The specification of λδ version 1 is dismissed.
87 <news date="March 2008.">
88 The specification of λδ version 2 is started with Coq 7.3.1 (false start).
90 <news date="September 2007.">
91 The <rlink to="version_1.html#dynamic">
92 specification of λδ version 1 for Matita 0.4</rlink>
95 <news date="November 2006.">
96 <rlink to="documentation.html#ldp3">λδ version 1</rlink>
99 <news date="December 2005.">
100 <rlink to="documentation.html#ldt1">First communication on λδ</rlink>.
102 <news date="May 2004.">
103 The specification of <rlink to="version_1.html">λδ version 1</rlink>
104 is started with Coq 7.3.1.
108 <section4 name="visibility">Visibility</section4>
110 <news date="June 2014.">
111 The <link to="http://www.google.com/">Google</link>
112 search for "formal system lambda delta" gives
113 5 resources about λδ in the first 6 results.
115 <news date="June 2014.">
116 The <link to="http://www.yahoo.com/">Yahoo</link>
117 search for "formal system lambda delta" gives
118 4 resources about λδ in the first 5 results.