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="March 2015.">
15 The specification of λδ version 1 is validated by
16 <link to="http://matita.cs.unibo.it/">Matita 0.99.2</link>.
19 <news class="gamma" date="February 2015.">
20 <rlink to="implementation.html#v2">"Helena 0.8.2"</rlink> is updated.
22 The translated specification of Landau's "Grundlagen der Analysis"
23 is validated in λC by <link to="http://coq.inria.fr/">Coq 8.4.3</link>.
27 <news class="delta" date="January 2015.">
28 The specification of <rlink to="specification.html#v1">λδ version 1</rlink>
29 is updated with backports from the abandoned specification of λδ version 2.
32 <news class="gamma" date="December 2014.">
33 <rlink to="implementation.html#v2">"Helena 0.8.2"</rlink> is released.
35 The corrected specification of Landau's "Grundlagen der Analysis"
36 is validated in λδ version 3.
40 <news class="gamma" date="October 2014.">
41 <rlink to="documentation.html#ldJ2a">λδ version 2A</rlink>
45 <news class="beta" date="July 2014.">
46 A new version of this site is online.
49 <news class="beta" date="June 2014.">
50 <rlink to="documentation.html#ldP2c">First communication on λδ version 2.</rlink>
53 <news class="alpha" date="December 2012.">
54 The character "_" is removed from the denomination "lambda_delta":
56 The denomination "\lambda\delta" is used in λδ-related texts.
58 The denomination "lambdadelta" is used in λδ-related identifiers.
60 Permanent λδ URL acquired:
61 <rlink to="">http://lambdadelta.info/</rlink>
62 (pointing at this site).
66 <news class="alpha" date="September 2011.">
67 The denomination "lambda-delta" changes to "lambda_delta":
69 The character "-" is reserved in λδ textual syntax
70 (recognized by "Helena 0.8.1").
72 Eventually, the occurrences of the character "-"
73 will be replaced by "_" in all λδ-related identifiers.
75 In particular, this refactoring involves file names and path names.
79 <news class="alpha" date="April 2011.">
80 The specification of <rlink to="specification.html#v2">λδ version 2</rlink>
81 and related topics is restarted in
82 <link to="http://matita.cs.unibo.it/">Matita 0.5</link>.
85 <news class="delta" date="February 2011.">
86 The specification of λδ version 2 with Coq 7.3.1 is abandoned.
89 <news class="alpha" date="December 2010.">
90 Transient λδ URL acquired: http://lambda-delta.info/ (expires on December 2012).
93 <news class="beta" date="November 2010.">
94 <rlink to="implementation.html#v1">"Helena 0.8.1"</rlink> is released.
97 <news class="beta" date="September 2009.">
98 <rlink to="implementation.html#v0">"Helena 0.8.0"</rlink> is released and the
99 <rlink to="implementation.html#lddl">λδ Digital Library</rlink> is started.
102 <news class="alpha" date="June 2009.">
103 "Helena", a <rlink to="implementation.html#helena">validator for λδ version 2</rlink>,
104 is available as a part of the <link to="http://helm.cs.unibo.it/">HELM</link> software.
107 <news class="alpha" date="September 2008.">
111 <news class="delta" date="July 2008.">
112 <rlink to="documentation.html#ldJ1">First journal paper on λδ</rlink>
113 accepted for publication.
116 <news class="delta" date="July 2008.">
117 First <link to="http://helm.cs.unibo.it/procedural/">procedural reconstruction</link>
118 for <link to="http://matita.cs.unibo.it/">Matita 0.5</link>
119 of the λδ version 1 for Coq 7.3.1.
122 <news class="delta" date="June 2008.">
123 The <rlink to="specification.html#static1">
124 HTML pages of the specification of λδ version 1 for Matita 0.5</rlink>
128 <news class="delta" date="May 2008.">
129 The specification of λδ version 1 is concluded.
132 <news class="alpha" date="March 2008.">
133 The specification of λδ version 2 is started with Coq 7.3.1 (false start).
136 <news class="gamma" date="September 2007.">
137 The <rlink to="specification.html#dynamic1">
138 specification of λδ version 1 for Matita 0.4</rlink>
142 <news class="gamma" date="November 2006.">
143 <rlink to="documentation.html#ldR1b">λδ version 1</rlink>
147 <news class="beta" date="December 2005.">
148 <rlink to="documentation.html#ldP1a">First communication on λδ version 1</rlink>.
151 <news class="alpha" date="May 2004.">
152 The specification of <rlink to="specification.html#v1">λδ version 1</rlink>
153 is started with Coq 7.3.1.
156 <!-- ===================================================================== -->
158 <section3 name="visibility">Visibility</section3>
160 <news class="alpha" date="June 2014.">
161 The <link to="http://www.google.com/">Google</link>
162 search for "formal system lambda delta" gives
163 5 resources about λδ in the first 6 results.
166 <news class="alpha" date="June 2014.">
167 The <link to="http://www.yahoo.com/">Yahoo</link>
168 search for "formal system lambda delta" gives
169 4 resources about λδ in the first 5 results.