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="February 2015.">
15 <rlink to="implementation.html#v2">"Helena 0.8.2"</rlink> is updated.
17 The translated specification of Landau's "Grundlagen der Analysis"
18 is validated in λC by <link to="http://coq.inria.fr/">Coq 8.4.3</link>.
22 <news class="delta" date="January 2015.">
23 The specification of <rlink to="specification.html#v1">λδ version 1</rlink>
24 is updated with backports from the abandoned specification of λδ version 2.
27 <news class="gamma" date="December 2014.">
28 <rlink to="implementation.html#v2">"Helena 0.8.2"</rlink> is released.
30 The corrected specification of Landau's "Grundlagen der Analysis"
31 is validated in λδ version 3.
35 <news class="gamma" date="October 2014.">
36 <rlink to="documentation.html#ldJ2">λδ version 2A</rlink>
40 <news class="beta" date="July 2014.">
41 A new version of this site is online.
44 <news class="beta" date="June 2014.">
45 <rlink to="documentation.html#ldP8">First communication on λδ version 2.</rlink>
48 <news class="alpha" date="December 2012.">
49 The character "_" is removed from the denomination "lambda_delta":
51 The denomination "\lambda\delta" is used in λδ-related texts.
53 The denomination "lambdadelta" is used in λδ-related identifiers.
55 Permanent λδ URL acquired:
56 <rlink to="">http://lambdadelta.info/</rlink>
57 (pointing at this site).
61 <news class="alpha" date="September 2011.">
62 The denomination "lambda-delta" changes to "lambda_delta":
64 The character "-" is reserved in λδ textual syntax
65 (recognized by "Helena 0.8.1").
67 Eventually, the occurrences of the character "-"
68 will be replaced by "_" in all λδ-related identifiers.
70 In particular, this refactoring involves file names and path names.
74 <news class="alpha" date="April 2011.">
75 The specification of <rlink to="specification.html#v2">λδ version 2</rlink>
76 and related topics is restarted in
77 <link to="http://matita.cs.unibo.it/">Matita 0.5</link>.
80 <news class="delta" date="February 2011.">
81 The specification of λδ version 2 with Coq 7.3.1 is abandoned.
84 <news class="alpha" date="December 2010.">
85 Transient λδ URL acquired: http://lambda-delta.info/ (expires on December 2012).
88 <news class="beta" date="November 2010.">
89 <rlink to="implementation.html#v1">"Helena 0.8.1"</rlink> is released.
92 <news class="beta" date="September 2009.">
93 <rlink to="implementation.html#v0">"Helena 0.8.0"</rlink> is released and the
94 <rlink to="implementation.html#lddl">λδ Digital Library</rlink> is started.
97 <news class="alpha" date="June 2009.">
98 "Helena", a <rlink to="implementation.html#helena">validator for λδ version 2</rlink>,
99 is available as a part of the <link to="http://helm.cs.unibo.it/">HELM</link> software.
102 <news class="alpha" date="September 2008.">
106 <news class="delta" date="July 2008.">
107 <rlink to="documentation.html#ldJ1">First journal paper on λδ</rlink>
108 accepted for publication.
111 <news class="delta" date="July 2008.">
112 First <link to="http://helm.cs.unibo.it/procedural/">procedural reconstruction</link>
113 for <link to="http://matita.cs.unibo.it/">Matita 0.5</link>
114 of the λδ version 1 for Coq 7.3.1.
117 <news class="delta" date="June 2008.">
118 The <rlink to="specification.html#static1">
119 HTML pages of the specification of λδ version 1 for Matita 0.5</rlink>
123 <news class="delta" date="May 2008.">
124 The specification of λδ version 1 is concluded.
127 <news class="alpha" date="March 2008.">
128 The specification of λδ version 2 is started with Coq 7.3.1 (false start).
131 <news class="gamma" date="September 2007.">
132 The <rlink to="specification.html#dynamic1">
133 specification of λδ version 1 for Matita 0.4</rlink>
137 <news class="gamma" date="November 2006.">
138 <rlink to="documentation.html#ldR2">λδ version 1</rlink>
142 <news class="beta" date="December 2005.">
143 <rlink to="documentation.html#ldP1">First communication on λδ version 1</rlink>.
146 <news class="alpha" date="May 2004.">
147 The specification of <rlink to="specification.html#v1">λδ version 1</rlink>
148 is started with Coq 7.3.1.
151 <!-- ===================================================================== -->
153 <section3 name="visibility">Visibility</section3>
155 <news class="alpha" date="June 2014.">
156 The <link to="http://www.google.com/">Google</link>
157 search for "formal system lambda delta" gives
158 5 resources about λδ in the first 6 results.
161 <news class="alpha" date="June 2014.">
162 The <link to="http://www.yahoo.com/">Yahoo</link>
163 search for "formal system lambda delta" gives
164 4 resources about λδ in the first 5 results.