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"
7 head = "The Formal Systems of the λδ (\lambda\delta) Family"
9 <sitemap name="sitemap"/>
11 <!-- ===================================================================== -->
13 <section3 name="milestones">Milestones</section3>
15 <news class="alpha" date="December 2015.">
16 <rlink to="documentation.html#ldJ3a">Second journal paper on λδ</rlink>
17 accepted for publication.
20 <news class="gamma" date="December 2015.">
21 <rlink to="implementation.html#v3">"Helena 0.8.3"</rlink> is released.
24 <news class="delta" date="August 2015.">
25 The specification of λδ version 2A1 is concluded.
28 <news class="gamma" date="June 2015.">
29 The corrected specification of Landau's "Grundlagen der Analysis"
30 is validated in a λProlog implementation of λδ version 3.
33 <news class="delta" date="March 2015.">
34 The specification of λδ version 1 is validated by
35 <link to="http://matita.cs.unibo.it/">Matita 0.99.2</link>.
38 <news class="gamma" date="February 2015.">
39 <rlink to="implementation.html#v2">"Helena 0.8.2"</rlink> is updated.
41 The translated specification of Landau's "Grundlagen der Analysis"
42 is validated in CC by <link to="http://coq.inria.fr/">Coq 8.4.3</link>.
46 <news class="delta" date="January 2015.">
47 The specification of <rlink to="specification.html#v1">λδ version 1</rlink>
48 is updated with backports from the abandoned specification of λδ version 2.
51 <news class="gamma" date="December 2014.">
52 <rlink to="implementation.html#v2">"Helena 0.8.2"</rlink> is released.
54 The corrected specification of Landau's "Grundlagen der Analysis"
55 is validated in λδ version 3.
59 <news class="gamma" date="October 2014.">
60 <rlink to="documentation.html#ldJ2a">λδ version 2A1</rlink>
64 <news class="beta" date="July 2014.">
65 A new version of this site is online.
68 <news class="beta" date="June 2014.">
69 <rlink to="documentation.html#ldP2c">First communication on λδ version 2.</rlink>
72 <news class="alpha" date="December 2012.">
73 The character "_" is removed from the denomination "lambda_delta":
75 The denomination "\lambda\delta" is used in λδ-related texts.
77 The denomination "lambdadelta" is used in λδ-related identifiers.
79 Permanent λδ URL acquired:
80 <rlink to="">http://lambdadelta.info/</rlink>
81 (pointing at this site).
85 <news class="alpha" date="September 2011.">
86 The denomination "lambda-delta" changes to "lambda_delta":
88 The character "-" is reserved in λδ textual syntax
89 (recognized by "Helena 0.8.1").
91 Eventually, the occurrences of the character "-"
92 will be replaced by "_" in all λδ-related identifiers.
94 In particular, this refactoring involves file names and path names.
98 <news class="alpha" date="April 2011.">
99 The specification of <rlink to="specification.html#v2">λδ version 2</rlink>
100 and related topics is restarted in
101 <link to="http://matita.cs.unibo.it/">Matita 0.5</link>.
104 <news class="delta" date="February 2011.">
105 The specification of λδ version 2 with Coq 7.3.1 is abandoned.
108 <news class="alpha" date="December 2010.">
109 Transient λδ URL acquired: http://lambda-delta.info/ (expires on December 2012).
112 <news class="beta" date="November 2010.">
113 <rlink to="implementation.html#v1">"Helena 0.8.1"</rlink> is released.
116 <news class="beta" date="September 2009.">
117 <rlink to="implementation.html#v0">"Helena 0.8.0"</rlink> is released and the
118 <rlink to="implementation.html#lddl">λδ Digital Library</rlink> is started.
121 <news class="alpha" date="June 2009.">
122 "Helena", a <rlink to="implementation.html#helena">validator for λδ version 2</rlink>,
123 is available as a part of the <link to="http://helm.cs.unibo.it/">HELM</link> software.
126 <news class="alpha" date="September 2008.">
130 <news class="delta" date="July 2008.">
131 <rlink to="documentation.html#ldJ1a">First journal paper on λδ</rlink>
132 accepted for publication.
135 <news class="delta" date="July 2008.">
136 First <link to="http://helm.cs.unibo.it/procedural/">procedural reconstruction</link>
137 for <link to="http://matita.cs.unibo.it/">Matita 0.5</link>
138 of the λδ version 1 for Coq 7.3.1.
141 <news class="delta" date="June 2008.">
142 The <rlink to="specification.html#static1">
143 HTML pages of the specification of λδ version 1 for Matita 0.5</rlink>
147 <news class="delta" date="May 2008.">
148 The specification of λδ version 1 is concluded.
151 <news class="alpha" date="March 2008.">
152 The specification of λδ version 2 is started with Coq 7.3.1 (false start).
155 <news class="gamma" date="September 2007.">
156 The <rlink to="specification.html#dynamic1">
157 specification of λδ version 1 for Matita 0.4</rlink>
161 <news class="gamma" date="November 2006.">
162 <rlink to="documentation.html#ldR1b">λδ version 1</rlink>
166 <news class="beta" date="December 2005.">
167 <rlink to="documentation.html#ldP1a">First communication on λδ version 1</rlink>.
170 <news class="alpha" date="May 2004.">
171 The specification of <rlink to="specification.html#v1">λδ version 1</rlink>
172 is started with Coq 7.3.1.
175 <!-- ===================================================================== -->
177 <section3 name="visibility">Visibility</section3>
179 <news class="alpha" date="June 2014.">
180 The <link to="http://www.google.com/">Google</link>
181 search for "formal system lambda delta" gives
182 5 resources about the λδ family in the first 6 results.
185 <news class="alpha" date="June 2014.">
186 The <link to="http://www.yahoo.com/">Yahoo</link>
187 search for "formal system lambda delta" gives
188 4 resources about the λδ family in the first 5 results.