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 <section9 name="specifications">Computer-checked formal specifications</section9>
12 λδ comes in several versions listed in the following table,
13 which includes the major milestones:
15 <table name="versions"/>
17 <section5 name="tools">Tools</section5>
19 <section name="lddl"><crux-icon/>λδ Digital Library (LDDL)</section>
21 The λδ Digital Library is part of <link to="http://helm.cs.unibo.it/">HELM</link>
22 and contains resources expressed in λδ.
24 <news date="Contents:">
25 Landau's "Grundlagen der Analysis"
26 (from Jutting's specification in <link to="http://www.win.tue.nl/automath/">Automath</link>).
29 <rlink to="static/lddl/">static pages</rlink> (updated <date date="2012-10"/>),
30 <rlink to="download/lddl.tar.bz2">data set</rlink> (updated <date date="2012-10"/>),
31 <rlink to="xml/">HELM server URL</rlink> (updated <date date="2012-10"/>).
33 <news date="Examples:">
34 <rlink to="static/lddl/brg_si/grundlagen/l/e/st/eq/landau/n/rt/rp/r/c/8283/t234.ld.html">
35 Grundlagen's definition "t234"</rlink>
37 <rlink to="static/lddl/crg_si/grundlagen/l/e/st/eq/landau/n/rt/rp/r/c/8283/t234.ld.html">
38 Grundlagen's definition "t234"</rlink>
39 (in "complete_rg" λδ).
42 <section name="helena"><helena-icon/>Helena</section>
44 Helena is a λδ processor,
45 implemented in <link to="http://caml.inria.fr/">Caml</link>
46 as a part of the <link to="http://helm.cs.unibo.it/">HELM</link> software,
47 meant for testing the stable features of the calculus as well as the unstable ones.
50 The processor source code is available in the directory
51 <link to="http://helm.cs.unibo.it/websvn/listing.php?repname=helm&path=%2Ftrunk%2Fhelm%2Fsoftware%2Fhelena%2F&rev=0&sc=0">/trunk/helm/software/helena/</link>
52 of the <link to="http://helm.cs.unibo.it/software/index.html">HELM Svn repository</link>.
53 The Svn revisions containing the stable versions of Helena are indicated next.
55 <news date="Version 0.8.2.">
58 <news date="Version 0.8.1 (2010-11).">
59 Exploits a subset of "complete_rg" λδ as the intermediate language.
60 Features importation from ".hln" files containing λδ textual syntax.
61 The overall validation speed of the "Grundlagen der Analysis"
62 increases of 22% with respect to version 0.8.0.
63 [Svn revision: 11032] (<rlink to="download/helena_0.8.1.tar.gz">archived source code</rlink>)
65 A <link to="http://www.jedsoft.org/jed/">Jed mode</link>
66 for editing ".hln" files (containing λδ textual syntax):
67 <rlink to="download/helena.sl">helena.sl</rlink>
68 (revised <date date="2010-11"/>).
70 <date date="2009-12."/>
71 Helena appears in F. Wiedijk's
72 <link to="http://www.cs.ru.nl/%7Efreek/digimath/index.html#helena">
73 index of computer math systems</link>.
76 <news date="Version 0.8.0 (2009-09).">
77 Supports "basic_rg" λδ with naive implementation of impredicative sort inclusion.
78 Features importation from <link to="http://www.win.tue.nl/automath/">Automath</link>
79 and exportation to <link to="http://www.w3.org/XML/">XML</link>.
80 <rlink to="documentation.html#ldR4">Documentation (R4)</rlink>.
81 [Svn revision: 10304] (<rlink to="download/helena_0.8.0.tar.gz">archived source code</rlink>).
83 A <link to="http://www.jedsoft.org/jed/">Jed mode</link>
84 for editing ".aut" files
85 (containing <link to="http://www.win.tue.nl/automath/">Automath</link> textual syntax):
86 <rlink to="download/automath.sl">automath.sl</rlink>
87 (revised <date date="2008-07"/>).
89 <date date="2009-09."/>
90 Jutting's specification of Landau's "Grundlagen der Analysis"
91 enters λδ Digital Library.
93 <date date="2009-06."/>
94 Jutting's specification of Landau's "Grundlagen der Analysis"
95 is successfully processed, enabling sort inclusion.