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="gamma" date="November 2019.">
17 <rlink to="html/documentation.html#ldV2b">λδ-2B</rlink>
21 <news class="alpha" date="December 2015.">
22 <rlink to="html/documentation.html#ldJ3a">Second journal paper on λδ</rlink>
23 accepted for publication.
26 <news class="gamma" date="December 2015.">
27 <rlink to="html/implementation.html#v3">"Helena 0.8.3"</rlink> is released.
30 <news class="delta" date="August 2015.">
31 The specification of λδ-2A is concluded.
34 <news class="gamma" date="June 2015.">
35 The corrected specification of Landau's "Grundlagen der Analysis"
36 is validated in a λProlog implementation of λδ-3.
39 <news class="delta" date="March 2015.">
40 The specification of λδ-1A is validated by
41 <link to="http://matita.cs.unibo.it/">Matita 0.99.2</link>.
44 <news class="gamma" date="February 2015.">
45 <rlink to="html/implementation.html#v2">"Helena 0.8.2"</rlink> is updated.
47 The translated specification of Landau's "Grundlagen der Analysis"
48 is validated in CC by <link to="http://coq.inria.fr/">Coq 8.4.3</link>.
52 <news class="delta" date="January 2015.">
53 The specification of <rlink to="html/specification.html#v1">λδ-1A</rlink>
54 is updated with backports from the abandoned specification of λδ-2.
57 <news class="gamma" date="December 2014.">
58 <rlink to="html/implementation.html#v2">"Helena 0.8.2"</rlink> is released.
60 The corrected specification of Landau's "Grundlagen der Analysis"
65 <news class="gamma" date="October 2014.">
67 <rlink to="html/documentation.html#ldR2c">λδ-2A</rlink>
71 <news class="beta" date="July 2014.">
72 A new version of this site is online.
75 <news class="beta" date="June 2014.">
76 <rlink to="html/documentation.html#ldP2c">First communication on λδ-2.</rlink>
79 <news class="alpha" date="December 2012.">
80 The character "_" is removed from the denomination "lambda_delta":
82 The denomination "\lambda\delta" is used in λδ-related texts.
84 The denomination "lambdadelta" is used in λδ-related identifiers.
86 Permanent λδ URL acquired:
87 <rlink to="">http://lambdadelta.info/</rlink>
88 (pointing at this site).
92 <news class="alpha" date="September 2011.">
93 The denomination "lambda-delta" changes to "lambda_delta":
95 The character "-" is reserved in λδ textual syntax
96 (recognized by "Helena 0.8.1").
98 Eventually, the occurrences of the character "-"
99 will be replaced by "_" in all λδ-related identifiers.
101 In particular, this refactoring involves file names and path names.
105 <news class="alpha" date="April 2011.">
107 <rlink to="html/specification.html#v2">λδ-2</rlink>
108 and related topics is restarted in
109 <link to="http://matita.cs.unibo.it/">Matita 0.5</link>.
112 <news class="delta" date="February 2011.">
113 The specification of λδ-2 with Coq 7.3.1 is abandoned.
116 <news class="alpha" date="December 2010.">
117 Transient λδ URL acquired: http://lambda-delta.info/ (expires on December 2012).
120 <news class="beta" date="November 2010.">
121 <rlink to="html/implementation.html#v1">"Helena 0.8.1"</rlink> is released.
124 <news class="beta" date="September 2009.">
125 <rlink to="html/implementation.html#v0">"Helena 0.8.0"</rlink> is released and the
126 <rlink to="html/implementation.html#lddl">λδ Digital Library</rlink> is started.
129 <news class="alpha" date="June 2009.">
130 "Helena", a <rlink to="html/implementation.html#helena">validator for λδ-2</rlink>,
131 is available as a part of the <link to="http://helm.cs.unibo.it/">HELM</link> software.
134 <news class="alpha" date="September 2008.">
138 <news class="delta" date="July 2008.">
139 <rlink to="html/documentation.html#ldJ1a">First journal paper on λδ</rlink>
140 accepted for publication.
143 <news class="delta" date="July 2008.">
144 First <link to="http://helm.cs.unibo.it/procedural/">procedural reconstruction</link>
145 for <link to="http://matita.cs.unibo.it/">Matita 0.5</link>
146 of the λδ-1A for Coq 7.3.1.
149 <news class="delta" date="June 2008.">
150 The <rlink to="html/specification.html#static1">
151 HTML pages of the specification of λδ-1A for Matita 0.5</rlink>
155 <news class="delta" date="May 2008.">
156 The specification of λδ-1A is concluded.
159 <news class="alpha" date="March 2008.">
160 The specification of λδ-2 is started with Coq 7.3.1 (false start).
163 <news class="gamma" date="September 2007.">
164 The <rlink to="html/specification.html#dynamic1">
165 specification of λδ-1A for Matita 0.4</rlink>
169 <news class="gamma" date="November 2006.">
171 <rlink to="html/documentation.html#ldR1b">λδ-1A</rlink>
175 <news class="beta" date="December 2005.">
176 <rlink to="html/documentation.html#ldP1a">First communication on λδ-1</rlink>.
179 <news class="alpha" date="May 2004.">
180 The specification of <rlink to="html/specification.html#v1">λδ-1</rlink>
181 is started with Coq 7.3.1.
184 <!-- ===================================================================== -->
186 <section3 name="visibility">Visibility</section3>
188 <news class="alpha" date="June 2014.">
189 The <link to="http://www.google.com/">Google</link>
190 search for "formal system lambda delta" gives
191 5 resources about the λδ family in the first 6 results.
194 <news class="alpha" date="June 2014.">
195 The <link to="http://www.yahoo.com/">Yahoo</link>
196 search for "formal system lambda delta" gives
197 4 resources about the λδ family in the first 5 results.