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 Systems of the λδ (\lambda\delta) Family"
8 <sitemap name="sitemap"/>
10 <!-- ===================================================================== -->
12 <section3 name="milestones">Milestones</section3>
14 <news class="alpha" date="December 2015.">
15 <rlink to="documentation.html#ldJ3a">Second journal paper on λδ</rlink>
16 accepted for publication.
19 <news class="gamma" date="December 2015.">
20 <rlink to="implementation.html#v3">"Helena 0.8.3"</rlink> is released.
23 <news class="delta" date="August 2015.">
24 The specification of λδ version 2A1 is concluded.
27 <news class="gamma" date="June 2015.">
28 The corrected specification of Landau's "Grundlagen der Analysis"
29 is validated in a λProlog implementation of λδ version 3.
32 <news class="delta" date="March 2015.">
33 The specification of λδ version 1 is validated by
34 <link to="http://matita.cs.unibo.it/">Matita 0.99.2</link>.
37 <news class="gamma" date="February 2015.">
38 <rlink to="implementation.html#v2">"Helena 0.8.2"</rlink> is updated.
40 The translated specification of Landau's "Grundlagen der Analysis"
41 is validated in CC by <link to="http://coq.inria.fr/">Coq 8.4.3</link>.
45 <news class="delta" date="January 2015.">
46 The specification of <rlink to="specification.html#v1">λδ version 1</rlink>
47 is updated with backports from the abandoned specification of λδ version 2.
50 <news class="gamma" date="December 2014.">
51 <rlink to="implementation.html#v2">"Helena 0.8.2"</rlink> is released.
53 The corrected specification of Landau's "Grundlagen der Analysis"
54 is validated in λδ version 3.
58 <news class="gamma" date="October 2014.">
59 <rlink to="documentation.html#ldJ2a">λδ version 2A1</rlink>
63 <news class="beta" date="July 2014.">
64 A new version of this site is online.
67 <news class="beta" date="June 2014.">
68 <rlink to="documentation.html#ldP2c">First communication on λδ version 2.</rlink>
71 <news class="alpha" date="December 2012.">
72 The character "_" is removed from the denomination "lambda_delta":
74 The denomination "\lambda\delta" is used in λδ-related texts.
76 The denomination "lambdadelta" is used in λδ-related identifiers.
78 Permanent λδ URL acquired:
79 <rlink to="">http://lambdadelta.info/</rlink>
80 (pointing at this site).
84 <news class="alpha" date="September 2011.">
85 The denomination "lambda-delta" changes to "lambda_delta":
87 The character "-" is reserved in λδ textual syntax
88 (recognized by "Helena 0.8.1").
90 Eventually, the occurrences of the character "-"
91 will be replaced by "_" in all λδ-related identifiers.
93 In particular, this refactoring involves file names and path names.
97 <news class="alpha" date="April 2011.">
98 The specification of <rlink to="specification.html#v2">λδ version 2</rlink>
99 and related topics is restarted in
100 <link to="http://matita.cs.unibo.it/">Matita 0.5</link>.
103 <news class="delta" date="February 2011.">
104 The specification of λδ version 2 with Coq 7.3.1 is abandoned.
107 <news class="alpha" date="December 2010.">
108 Transient λδ URL acquired: http://lambda-delta.info/ (expires on December 2012).
111 <news class="beta" date="November 2010.">
112 <rlink to="implementation.html#v1">"Helena 0.8.1"</rlink> is released.
115 <news class="beta" date="September 2009.">
116 <rlink to="implementation.html#v0">"Helena 0.8.0"</rlink> is released and the
117 <rlink to="implementation.html#lddl">λδ Digital Library</rlink> is started.
120 <news class="alpha" date="June 2009.">
121 "Helena", a <rlink to="implementation.html#helena">validator for λδ version 2</rlink>,
122 is available as a part of the <link to="http://helm.cs.unibo.it/">HELM</link> software.
125 <news class="alpha" date="September 2008.">
129 <news class="delta" date="July 2008.">
130 <rlink to="documentation.html#ldJ1a">First journal paper on λδ</rlink>
131 accepted for publication.
134 <news class="delta" date="July 2008.">
135 First <link to="http://helm.cs.unibo.it/procedural/">procedural reconstruction</link>
136 for <link to="http://matita.cs.unibo.it/">Matita 0.5</link>
137 of the λδ version 1 for Coq 7.3.1.
140 <news class="delta" date="June 2008.">
141 The <rlink to="specification.html#static1">
142 HTML pages of the specification of λδ version 1 for Matita 0.5</rlink>
146 <news class="delta" date="May 2008.">
147 The specification of λδ version 1 is concluded.
150 <news class="alpha" date="March 2008.">
151 The specification of λδ version 2 is started with Coq 7.3.1 (false start).
154 <news class="gamma" date="September 2007.">
155 The <rlink to="specification.html#dynamic1">
156 specification of λδ version 1 for Matita 0.4</rlink>
160 <news class="gamma" date="November 2006.">
161 <rlink to="documentation.html#ldR1b">λδ version 1</rlink>
165 <news class="beta" date="December 2005.">
166 <rlink to="documentation.html#ldP1a">First communication on λδ version 1</rlink>.
169 <news class="alpha" date="May 2004.">
170 The specification of <rlink to="specification.html#v1">λδ version 1</rlink>
171 is started with Coq 7.3.1.
174 <!-- ===================================================================== -->
176 <section3 name="visibility">Visibility</section3>
178 <news class="alpha" date="June 2014.">
179 The <link to="http://www.google.com/">Google</link>
180 search for "formal system lambda delta" gives
181 5 resources about the λδ family in the first 6 results.
184 <news class="alpha" date="June 2014.">
185 The <link to="http://www.yahoo.com/">Yahoo</link>
186 search for "formal system lambda delta" gives
187 4 resources about the λδ family in the first 5 results.