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="August 2015.">
15 The specification of λδ version 2A1 is concluded.
18 <news class="delta" date="March 2015.">
19 The specification of λδ version 1 is validated by
20 <link to="http://matita.cs.unibo.it/">Matita 0.99.2</link>.
23 <news class="gamma" date="February 2015.">
24 <rlink to="implementation.html#v2">"Helena 0.8.2"</rlink> is updated.
26 The translated specification of Landau's "Grundlagen der Analysis"
27 is validated in λC by <link to="http://coq.inria.fr/">Coq 8.4.3</link>.
31 <news class="delta" date="January 2015.">
32 The specification of <rlink to="specification.html#v1">λδ version 1</rlink>
33 is updated with backports from the abandoned specification of λδ version 2.
36 <news class="gamma" date="December 2014.">
37 <rlink to="implementation.html#v2">"Helena 0.8.2"</rlink> is released.
39 The corrected specification of Landau's "Grundlagen der Analysis"
40 is validated in λδ version 3.
44 <news class="gamma" date="October 2014.">
45 <rlink to="documentation.html#ldJ2a">λδ version 2A1</rlink>
49 <news class="beta" date="July 2014.">
50 A new version of this site is online.
53 <news class="beta" date="June 2014.">
54 <rlink to="documentation.html#ldP2c">First communication on λδ version 2.</rlink>
57 <news class="alpha" date="December 2012.">
58 The character "_" is removed from the denomination "lambda_delta":
60 The denomination "\lambda\delta" is used in λδ-related texts.
62 The denomination "lambdadelta" is used in λδ-related identifiers.
64 Permanent λδ URL acquired:
65 <rlink to="">http://lambdadelta.info/</rlink>
66 (pointing at this site).
70 <news class="alpha" date="September 2011.">
71 The denomination "lambda-delta" changes to "lambda_delta":
73 The character "-" is reserved in λδ textual syntax
74 (recognized by "Helena 0.8.1").
76 Eventually, the occurrences of the character "-"
77 will be replaced by "_" in all λδ-related identifiers.
79 In particular, this refactoring involves file names and path names.
83 <news class="alpha" date="April 2011.">
84 The specification of <rlink to="specification.html#v2">λδ version 2</rlink>
85 and related topics is restarted in
86 <link to="http://matita.cs.unibo.it/">Matita 0.5</link>.
89 <news class="delta" date="February 2011.">
90 The specification of λδ version 2 with Coq 7.3.1 is abandoned.
93 <news class="alpha" date="December 2010.">
94 Transient λδ URL acquired: http://lambda-delta.info/ (expires on December 2012).
97 <news class="beta" date="November 2010.">
98 <rlink to="implementation.html#v1">"Helena 0.8.1"</rlink> is released.
101 <news class="beta" date="September 2009.">
102 <rlink to="implementation.html#v0">"Helena 0.8.0"</rlink> is released and the
103 <rlink to="implementation.html#lddl">λδ Digital Library</rlink> is started.
106 <news class="alpha" date="June 2009.">
107 "Helena", a <rlink to="implementation.html#helena">validator for λδ version 2</rlink>,
108 is available as a part of the <link to="http://helm.cs.unibo.it/">HELM</link> software.
111 <news class="alpha" date="September 2008.">
115 <news class="delta" date="July 2008.">
116 <rlink to="documentation.html#ldJ1a">First journal paper on λδ</rlink>
117 accepted for publication.
120 <news class="delta" date="July 2008.">
121 First <link to="http://helm.cs.unibo.it/procedural/">procedural reconstruction</link>
122 for <link to="http://matita.cs.unibo.it/">Matita 0.5</link>
123 of the λδ version 1 for Coq 7.3.1.
126 <news class="delta" date="June 2008.">
127 The <rlink to="specification.html#static1">
128 HTML pages of the specification of λδ version 1 for Matita 0.5</rlink>
132 <news class="delta" date="May 2008.">
133 The specification of λδ version 1 is concluded.
136 <news class="alpha" date="March 2008.">
137 The specification of λδ version 2 is started with Coq 7.3.1 (false start).
140 <news class="gamma" date="September 2007.">
141 The <rlink to="specification.html#dynamic1">
142 specification of λδ version 1 for Matita 0.4</rlink>
146 <news class="gamma" date="November 2006.">
147 <rlink to="documentation.html#ldR1b">λδ version 1</rlink>
151 <news class="beta" date="December 2005.">
152 <rlink to="documentation.html#ldP1a">First communication on λδ version 1</rlink>.
155 <news class="alpha" date="May 2004.">
156 The specification of <rlink to="specification.html#v1">λδ version 1</rlink>
157 is started with Coq 7.3.1.
160 <!-- ===================================================================== -->
162 <section3 name="visibility">Visibility</section3>
164 <news class="alpha" date="June 2014.">
165 The <link to="http://www.google.com/">Google</link>
166 search for "formal system lambda delta" gives
167 5 resources about λδ in the first 6 results.
170 <news class="alpha" date="June 2014.">
171 The <link to="http://www.yahoo.com/">Yahoo</link>
172 search for "formal system lambda delta" gives
173 4 resources about λδ in the first 5 results.