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="delta" date="January 2015.">
15 The specification of <rlink to="specification.html#v1">λδ version 1</rlink>
16 is updated with backports from the abandoned specification of λδ version 2.
19 <news class="gamma" date="December 2014.">
20 <rlink to="implementation.html#v2">"Helena 0.8.2"</rlink> is released.
22 The corrected specification of Landau's "Grundlagen der Analysis"
23 is validated in λδ version 3.
27 <news class="gamma" date="October 2014.">
28 <rlink to="documentation.html#ldJ2">λδ version 2A</rlink>
32 <news class="beta" date="July 2014.">
33 A new version of this site is online.
36 <news class="beta" date="June 2014.">
37 <rlink to="documentation.html#ldP8">First communication on λδ version 2.</rlink>
40 <news class="alpha" date="December 2012.">
41 The character "_" is removed from the denomination "lambda_delta":
43 The denomination "\lambda\delta" is used in λδ-related texts.
45 The denomination "lambdadelta" is used in λδ-related identifiers.
47 Permanent λδ URL acquired:
48 <rlink to="">http://lambdadelta.info/</rlink>
49 (pointing at this site).
53 <news class="alpha" date="September 2011.">
54 The denomination "lambda-delta" changes to "lambda_delta":
56 The character "-" is reserved in λδ textual syntax
57 (recognized by "Helena 0.8.1").
59 Eventually, the occurrences of the character "-"
60 will be replaced by "_" in all λδ-related identifiers.
62 In particular, this refactoring involves file names and path names.
66 <news class="alpha" date="April 2011.">
67 The specification of <rlink to="specification.html#v2">λδ version 2</rlink>
68 and related topics is restarted in
69 <link to="http://matita.cs.unibo.it/">Matita 0.5</link>.
72 <news class="delta" date="February 2011.">
73 The specification of λδ version 2 with Coq 7.3.1 is abandoned.
76 <news class="alpha" date="December 2010.">
77 Transient λδ URL acquired: http://lambda-delta.info/ (expires on December 2012).
80 <news class="beta" date="November 2010.">
81 <rlink to="implementation.html#v1">"Helena 0.8.1"</rlink> is released.
84 <news class="beta" date="September 2009.">
85 <rlink to="implementation.html#v0">"Helena 0.8.0"</rlink> is released and the
86 <rlink to="implementation.html#lddl">λδ Digital Library</rlink> is started.
89 <news class="alpha" date="June 2009.">
90 "Helena", a <rlink to="implementation.html#helena">validator for λδ version 2</rlink>,
91 is available as a part of the <link to="http://helm.cs.unibo.it/">HELM</link> software.
94 <news class="alpha" date="September 2008.">
98 <news class="delta" date="July 2008.">
99 <rlink to="documentation.html#ldJ1">First journal paper on λδ</rlink>
100 accepted for publication.
103 <news class="delta" date="July 2008.">
104 First <link to="http://helm.cs.unibo.it/procedural/">procedural reconstruction</link>
105 for <link to="http://matita.cs.unibo.it/">Matita 0.5</link>
106 of the λδ version 1 for Coq 7.3.1.
109 <news class="delta" date="June 2008.">
110 The <rlink to="specification.html#static1">
111 HTML pages of the specification of λδ version 1 for Matita 0.5</rlink>
115 <news class="delta" date="May 2008.">
116 The specification of λδ version 1 is concluded.
119 <news class="alpha" date="March 2008.">
120 The specification of λδ version 2 is started with Coq 7.3.1 (false start).
123 <news class="gamma" date="September 2007.">
124 The <rlink to="specification.html#dynamic1">
125 specification of λδ version 1 for Matita 0.4</rlink>
129 <news class="gamma" date="November 2006.">
130 <rlink to="documentation.html#ldR2">λδ version 1</rlink>
134 <news class="beta" date="December 2005.">
135 <rlink to="documentation.html#ldP1">First communication on λδ version 1</rlink>.
138 <news class="alpha" date="May 2004.">
139 The specification of <rlink to="specification.html#v1">λδ version 1</rlink>
140 is started with Coq 7.3.1.
143 <!-- ===================================================================== -->
145 <section3 name="visibility">Visibility</section3>
147 <news class="alpha" date="June 2014.">
148 The <link to="http://www.google.com/">Google</link>
149 search for "formal system lambda delta" gives
150 5 resources about λδ in the first 6 results.
153 <news class="alpha" date="June 2014.">
154 The <link to="http://www.yahoo.com/">Yahoo</link>
155 search for "formal system lambda delta" gives
156 4 resources about λδ in the first 5 results.