1 <?xml version="1.0" encoding="UTF-8"?>
2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
3 <html xmlns="http://www.w3.org/1999/xhtml" dir="ltr" lang="en-us">
5 <meta http-equiv="Content-Language" content="en-us" />
6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
7 <meta http-equiv="Content-Style-Type" content="text/css" />
8 <meta name="author" content="Ferruccio Guidi" />
9 <meta name="description" content="\lambda\delta home page" />
10 <title>\lambda\delta home page</title>
11 <link rel="stylesheet" type="text/css" href="http://lambdadelta.info/css/ld_web.css" />
12 <link rel="stylesheet" type="text/css" href="http://lambdadelta.info/css/lddl.css" />
13 <link rel="stylesheet" type="text/css" href="http://lambdadelta.info/css/xhtbl.css" />
14 <link rel="shortcut icon" href="http://lambdadelta.info/images/crux_16.ico" />
18 <a href="http://lambdadelta.info/">
19 <img class="icon32" alt="[lambdadelta home]" title="lambdadelta home" src="http://lambdadelta.info/images/crux_32.png" />
22 <div class="head1">The Formal System λδ (\lambda\delta)</div>
24 <img class="rule" alt="[Spacer]" title="lambdadelta rainbow rule" src="http://lambdadelta.info/images/rainbow.png" />
26 <div xmlns:ld="http://lambdadelta.info/" class="spacer">
29 <div xmlns:ld="http://lambdadelta.info/" class="text">
30 <table cellpadding="4" cellspacing="0">
33 <td class="snns capitalize italic sky">
34 <a href="http://lambdadelta.info/index.html">home</a>
36 <td class="snns capitalize italic magenta">
37 <a href="http://lambdadelta.info/news.html">news</a>
39 <td class="snns capitalize italic orange">
40 <a href="http://lambdadelta.info/documentation.html">documentation</a>
42 <td class="snns capitalize italic green">
43 <a href="http://lambdadelta.info/specification.html">specification</a>
45 <td class="snnn capitalize italic green">
48 <td class="ssns capitalize italic green">
49 <a href="http://lambdadelta.info/implementation.html">implementation</a>
53 <td class="snns capitalize sky">
54 <a href="http://lambdadelta.info/index.html#foreword">foreword</a>
56 <td class="snns capitalize magenta">
57 <a href="http://lambdadelta.info/news.html#milestones">milestones</a>
59 <td class="snns capitalize orange">
60 <a href="http://lambdadelta.info/documentation.html#v2">version 2</a>
62 <td class="snns capitalize green">
63 <a href="http://lambdadelta.info/specification.html#v2">version 2</a>
65 <td class="snnn capitalize green">(<a href="http://lambdadelta.info/ground_2.html">background</a> - <a href="http://lambdadelta.info/basic_2.html">core</a> - <a href="http://lambdadelta.info/apps_2.html">applications</a>)</td>
66 <td class="ssns capitalize green">
67 <a href="http://lambdadelta.info/implementation.html#lddl">library</a>
71 <td class="snss capitalize sky">
72 <a href="http://lambdadelta.info/index.html#citations">citations</a>
74 <td class="snss capitalize magenta">
75 <a href="http://lambdadelta.info/news.html#visibility">visibility</a>
77 <td class="snss capitalize orange">
78 <a href="http://lambdadelta.info/documentation.html#v1">version 1</a>
80 <td class="snss capitalize green">
81 <a href="http://lambdadelta.info/specification.html#v1">version 1</a>
83 <td class="snsn capitalize green">
86 <td class="ssss capitalize green">
87 <a href="http://lambdadelta.info/implementation.html#helena">helena</a>
94 <div xmlns:ld="http://lambdadelta.info/" class="head2dx" id="tools">Tools <img class="icon37" alt="[spacer]" title="lambdadelta butterfly" src="http://lambdadelta.info/images/b5.png" />
97 <div xmlns:ld="http://lambdadelta.info/" class="head3sn" id="lddl">
98 <img class="icon32" alt="[Crux logo]" title="the Crux" src="http://lambdadelta.info/images/crux_32.png" /> λδ Digital Library (LDDL)</div>
99 <div xmlns:ld="http://lambdadelta.info/" class="text">
100 The λδ Digital Library is part of <a href="http://helm.cs.unibo.it/">HELM</a>
101 and contains resources expressed in λδ.
103 <ul xmlns:ld="http://lambdadelta.info/" id="contents">
105 <span class="emph alpha">Contents:</span>
106 Landau's "Grundlagen der Analysis"
107 (from Jutting's specification in <a href="http://www.win.tue.nl/automath/">Automath</a>).
110 <ul xmlns:ld="http://lambdadelta.info/" id="access">
112 <span class="emph alpha">Access:</span>
113 <a href="http://lambdadelta.info/static/lddl/">static pages</a> (updated <span class="emph beta">2012-10</span>),
114 <a href="http://lambdadelta.info/download/lddl.tar.bz2">data set</a> (updated <span class="emph gamma">2014-12</span>),
115 <a href="http://lambdadelta.info/xml/">HELM server URL</a> (updated <span class="emph gamma">2014-12</span>).
118 <ul xmlns:ld="http://lambdadelta.info/" id="examples">
120 <span class="emph alpha">Examples:</span>
121 <a href="http://lambdadelta.info/static/lddl/brg_si/grundlagen/l/e/st/eq/landau/n/rt/rp/r/c/8283/t234.ld.html">
122 Grundlagen's definition "t234"</a>
124 <a href="http://lambdadelta.info/static/lddl/crg_si/grundlagen/l/e/st/eq/landau/n/rt/rp/r/c/8283/t234.ld.html">
125 Grundlagen's definition "t234"</a>
126 (in "complete_rg" λδ).
130 <div xmlns:ld="http://lambdadelta.info/" class="head3sn" id="helena">
131 <img class="icon32" alt="[Helena logo]" title="Helena" src="http://lambdadelta.info/images/helena_32.png" /> Helena</div>
132 <div xmlns:ld="http://lambdadelta.info/" class="text">
133 Helena is a λδ processor,
134 implemented in <a href="http://caml.inria.fr/">Caml</a>
135 as a part of the <a href="http://helm.cs.unibo.it/">HELM</a> software,
136 meant for testing the stable features of the calculus as well as the unstable ones.
138 <div xmlns:ld="http://lambdadelta.info/" class="text">
139 The processor source code is available in the directory
140 <a href="http://helm.cs.unibo.it/websvn/listing.php?repname=helm&path=%2Ftrunk%2Fhelm%2Fsoftware%2Fhelena%2F&rev=0&sc=0">/trunk/helm/software/helena/</a>
141 of the <a href="http://helm.cs.unibo.it/software/index.html">HELM Svn repository</a>.
142 The Svn revisions containing the stable versions of Helena are indicated next.
144 <ul xmlns:ld="http://lambdadelta.info/" id="v2">
146 <span class="emph beta">Version 0.8.2.</span>
150 The specification of Landau's "Grundlagen der Analysis"
151 for <a href="http://matita.cs.unibo.it/">Matita 0.99.2</a>:
152 <a href="http://lambdadelta.info/download/grundlagen_2.tar.bz2">grundlagen_2.tar.bz2</a>
153 (revised <span class="emph gamma">2014-12</span>).
156 The corrected specification of Landau's "Grundlagen der Analysis":
157 <a href="http://lambdadelta.info/download/grundlagen_2.aut">grundlagen_2.aut</a>
158 (revised <span class="emph gamma">2014-12</span>).
161 <span class="emph gamma">2014-12.</span>
162 The corrected specification of Landau's "Grundlagen der Analysis"
163 is successfully validated in λδ "Version 3".
168 <ul xmlns:ld="http://lambdadelta.info/" id="v1">
170 <span class="emph beta">Version 0.8.1 (2010-11).</span>
171 Uses a subset of λδ "Version 4" as the intermediate language.
172 Features importation from ".hln" files containing λδ textual syntax.
173 The overall validation speed of the "Grundlagen der Analysis"
174 increases of 22% with respect to version 0.8.0.
175 [Svn revision: 11032] (<a href="http://lambdadelta.info/download/helena_0.8.1.tar.gz">archived source code</a>)
178 A <a href="http://www.jedsoft.org/jed/">Jed mode</a>
179 for editing ".hln" files (containing λδ textual syntax):
180 <a href="http://lambdadelta.info/download/helena.sl">helena.sl</a>
181 (revised <span class="emph alpha">2010-11</span>).
184 <span class="emph beta">2009-12.</span>
185 Helena appears in F. Wiedijk's
186 <a href="http://www.cs.ru.nl/%7Efreek/digimath/index.html#helena">
187 index of computer math systems</a>.
192 <ul xmlns:ld="http://lambdadelta.info/" id="v0">
194 <span class="emph beta">Version 0.8.0 (2009-09).</span>
195 Supports λδ "Version 2" with naive implementation of impredicative sort inclusion.
196 Features importation from <a href="http://www.win.tue.nl/automath/">Automath</a>
197 and exportation to <a href="http://www.w3.org/XML/">XML</a>.
198 <a href="http://lambdadelta.info/documentation.html#ldR4">Documentation (R4)</a>.
199 [Svn revision: 10304] (<a href="http://lambdadelta.info/download/helena_0.8.0.tar.gz">archived source code</a>).
202 A <a href="http://www.jedsoft.org/jed/">Jed mode</a>
203 for editing ".aut" files
204 (containing <a href="http://www.win.tue.nl/automath/">Automath</a> textual syntax):
205 <a href="http://lambdadelta.info/download/automath.sl">automath.sl</a>
206 (revised <span class="emph gamma">2008-07</span>).
209 <span class="emph beta">2009-09.</span>
210 Jutting's specification of Landau's "Grundlagen der Analysis"
211 enters λδ Digital Library.
214 <span class="emph beta">2009-06.</span>
215 Jutting's specification of Landau's "Grundlagen der Analysis"
216 is successfully processed, enabling sort inclusion.
222 <img class="rule" alt="[Spacer]" title="lambdadelta rainbow rule" src="http://lambdadelta.info/images/rainbow.png" />
224 <div xmlns:ld="http://lambdadelta.info/" class="spacer">
227 <div xmlns:ld="http://lambdadelta.info/" class="spacer">
228 <a href="http://validator.w3.org/check?uri=referer">
229 <img class="w3c" alt="[Valid XHTML 1.1]" title="Valid XHTML 1.1" src="http://www.w3.org/Icons/valid-xhtml11-blue" />
231 <a href="http://jigsaw.w3.org/css-validator/check/referer">
232 <img class="w3c" alt="[Valid CSS level 2]" title="Valid CSS level 2" src="http://www.w3.org/Icons/valid-css2-blue" />
234 <a href="http://www.w3.org/XML/">
235 <img class="w3c" alt="[Generated from XML via XSL]" title="Generated from XML via XSL" src="http://lambdadelta.info/images/xml_xsl2.png" />
237 <a href="http://www.w3.org/Graphics/PNG/">
238 <img class="w3c" alt="[PNG used here]" title="PNG used here" src="http://lambdadelta.info/images/PNGnow2.png" />
240 <a href="http://www.anybrowser.org/campaign/">
241 <img class="w3c" alt="[Viewable with any browser]" title="Viewable with any browser" src="http://www.anybrowser.org/campaign/bvgraphics/abtfile.png" />
244 <div xmlns:ld="http://lambdadelta.info/" class="spacer">
247 <div xmlns:ld="http://lambdadelta.info/" class="spacer">Last update: Fri, 26 Dec 2014 16:35:05 +0100</div>