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 date="July 2014.">
15 A new version of this site is online.
18 <news date="June 2014.">
19 <rlink to="documentation.html#ldP8">First communication on λδ version 2.</rlink>
22 <news date="December 2012.">
23 The character "_" is removed from the denomination "lambda_delta":
25 The denomination "\lambda\delta" is used in λδ-related texts.
27 The denomination "lambdadelta" is used in λδ-related identifiers.
29 Permanent λδ URL acquired:
30 <rlink to="">http://lambdadelta.info/</rlink>
31 (pointing at this site).
35 <news date="September 2011.">
36 The denomination "lambda-delta" changes to "lambda_delta":
38 The character "-" is reserved in λδ textual syntax
39 (recognized by "Helena 0.8.1").
41 Eventually, the occurrences of the character "-"
42 will be replaced by "_" in all λδ-related identifiers.
44 In particular, this refactoring involves file names and path names.
48 <news date="April 2011.">
49 The specification of <rlink to="version_2.html">λδ version 2</rlink>
50 and related topics is restarted in
51 <link to="http://matita.cs.unibo.it/">Matita 0.5</link>.
54 <news date="December 2010.">
55 Transient λδ URL acquired: http://lambda-delta.info/ (expires on December 2012).
58 <news date="November 2010.">
59 "Helena 0.8.1" is released.
62 <news date="September 2009.">
63 "Helena 0.8.0" is released and the
64 <rlink to="implementation.html#lddl">λδ Digital Library</rlink>
68 <news date="June 2009.">
69 "Helena", a <rlink to="implementation.html#helena">validator for λδ version 2</rlink>,
70 is available as a part of the <link to="http://helm.cs.unibo.it/">HELM</link> software.
73 <news date="September 2008.">
77 <news date="July 2008.">
78 <rlink to="documentation.html#ldJ1">First journal paper on λδ</rlink>
79 accepted for publication.
82 <news date="July 2008.">
83 First <link to="http://helm.cs.unibo.it/procedural/">procedural reconstruction</link>
84 for <link to="http://matita.cs.unibo.it/">Matita 0.5</link>
85 of the λδ version 1 for Coq 7.3.1.
88 <news date="June 2008.">
89 The <rlink to="version_1.html#static">
90 HTML pages of the specification of λδ version 1 for Matita 0.5</rlink>
94 <news date="May 2008.">
95 The specification of λδ version 1 is dismissed.
98 <news date="March 2008.">
99 The specification of λδ version 2 is started with Coq 7.3.1 (false start).
102 <news date="September 2007.">
103 The <rlink to="version_1.html#dynamic">
104 specification of λδ version 1 for Matita 0.4</rlink>
108 <news date="November 2006.">
109 <rlink to="documentation.html#ldR2">λδ version 1</rlink>
113 <news date="December 2005.">
114 <rlink to="documentation.html#ldP1">First communication on λδ version 1</rlink>.
117 <news date="May 2004.">
118 The specification of <rlink to="version_1.html">λδ version 1</rlink>
119 is started with Coq 7.3.1.
122 <!-- ===================================================================== -->
124 <section3 name="citations">Citations</section3>
126 Here is a list of publications citing λδ (not including our own).
130 A. Asperti, W. Ricciotti, C. Sacerdoti Coen, E. Tassi:
131 <date date="Formal metatheory of programming languages in the Matita interactive theorem prover"/>
132 (2012). In JAR 49(3), pp. 427-451.
137 <date date="Consistency of the minimalist foundation with Church thesis and Bar Induction"/>
138 (2012). Submitted article.
143 <date date="Theoretical and implementation aspects in the mechanization of the metatheory of programming languages"/>
144 (July 2011). Ph.D. Thesis in Computer Science, Technical Report UBLCS-2011-09, University of Bologna.
149 <date date="Faithful Reproductions of the Automath Landau Formalization"/>
150 (2011). Typescript note.
155 <date date="A minimalist two-level foundation for constructive mathematics"/>
156 (2009). In APAL 160(3), pp. 319-354.
161 <date date="First Year Report: Realisability methods of proof and semantics with application to expansion"/>
162 (July 2007). Typescript note.
165 <!-- ===================================================================== -->
167 <section3 name="visibility">Visibility</section3>
169 <news date="June 2014.">
170 The <link to="http://www.google.com/">Google</link>
171 search for "formal system lambda delta" gives
172 5 resources about λδ in the first 6 results.
175 <news date="June 2014.">
176 The <link to="http://www.yahoo.com/">Yahoo</link>
177 search for "formal system lambda delta" gives
178 4 resources about λδ in the first 5 results.