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22 <div class="head1">The Formal System λδ (\lambda\delta)</div>
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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/implementation.html">implementation</a>
45 <td class="ssnn capitalize italic green">(<a href="http://lambdadelta.info/implementation.html#specifications">specifications</a> - <a href="http://lambdadelta.info/implementation.html#lddl">library</a> - <a href="http://lambdadelta.info/implementation.html#helena">Helena</a>)</td>
49 <a href="http://lambdadelta.info/index.html#foreword">Foreword</a>
51 <td class="snns magenta">
52 <a href="http://lambdadelta.info/news.html#milestones">Milestones</a>
54 <td class="snns orange">
55 <a href="http://lambdadelta.info/documentation.html#v2">Version 2</a>
57 <td class="snns green">
58 <a href="http://lambdadelta.info/version_2.html">Version 2</a>
60 <td class="ssnn 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>
64 <a href="http://lambdadelta.info/index.html#notice">Notice</a>
66 <td class="snss magenta">
67 <a href="http://lambdadelta.info/news.html#visibility">Visibility</a>
69 <td class="snss orange">
70 <a href="http://lambdadelta.info/documentation.html#v1">Version 1</a>
72 <td class="snss green">
73 <a href="http://lambdadelta.info/version_1.html">Version 1</a>
75 <td class="sssn green">
83 <div xmlns:ld="http://lambdadelta.info/" class="head2dx" id="specifications">Computer-checked formal specifications <img class="icon37" alt="[spacer]" title="lambdadelta butterfly" src="http://lambdadelta.info/images/b5.png" />
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86 λδ comes in several versions listed in the following table,
87 which includes the major milestones:
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90 <table cellpadding="4" cellspacing="0">
93 <td class="snns top capitalize italic gray">version</td>
94 <td class="snnn top capitalize italic gray">name</td>
95 <td class="snnn top capitalize italic gray">developed with</td>
96 <td class="snnn top capitalize italic gray">stage</td>
97 <td class="snnn top capitalize italic gray">started</td>
98 <td class="snnn top capitalize italic gray">announced</td>
99 <td class="snnn top capitalize italic gray">released</td>
100 <td class="ssnn top capitalize italic gray">dismissed</td>
103 <td class="snns top orange">
104 <a href="http://lambdadelta.info/version_2">Version 2</a>
106 <td class="snnn top orange">"basic_2"</td>
107 <td class="snnn top orange">
108 <a href="http://matita.cs.unibo.it/">Matita 0.99.2</a>
110 <td class="snnn top orange">"A"</td>
111 <td class="snnn top orange">April 2011</td>
112 <td class="snnn top orange">July 2014</td>
113 <td class="snnn top orange">Planned in 2014</td>
114 <td class="ssnn top orange">Not planned yet</td>
117 <td class="snss top red">
118 <a href="http://lambdadelta.info/version_1">Version 1</a>
120 <td class="snsn top red">"basic_1"</td>
121 <td class="snsn top red">
122 <a href="http://coq.inria.fr/">Coq 7.3.1</a>
124 <td class="snsn top red" />
125 <td class="snsn top red">May 2004</td>
126 <td class="snsn top red">January 2006</td>
127 <td class="snsn top red">November 2006</td>
128 <td class="sssn top red">May 2008</td>
134 <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" />
137 <div xmlns:ld="http://lambdadelta.info/" class="head2sn" id="lddl">
138 <img class="icon32" alt="[Crux logo]" title="the Crux" src="http://lambdadelta.info/images/crux_32.png" /> λδ Digital Library (LDDL)</div>
139 <div xmlns:ld="http://lambdadelta.info/" class="text">
140 The λδ Digital Library is part of <a href="http://helm.cs.unibo.it/">HELM</a>
141 and contains resources expressed in λδ.
143 <ul xmlns:ld="http://lambdadelta.info/">
145 <span class="date">Contents:</span>
146 Landau's "Grundlagen der Analysis"
147 (from Jutting's specification in <a href="http://www.win.tue.nl/automath/">Automath</a>).
150 <ul xmlns:ld="http://lambdadelta.info/">
152 <span class="date">Access:</span>
153 <a href="http://lambdadelta.info/static/lddl/">static pages</a> (updated <span class="date">2012-10</span>),
154 <a href="http://lambdadelta.info/download/lddl.tar.bz2">data set</a> (updated <span class="date">2012-10</span>),
155 <a href="http://lambdadelta.info/xml/">HELM server URL</a> (updated <span class="date">2012-10</span>).
158 <ul xmlns:ld="http://lambdadelta.info/">
160 <span class="date">Examples:</span>
161 <a href="http://lambdadelta.info/static/lddl/brg_si/grundlagen/l/e/st/eq/landau/n/rt/rp/r/c/8283/t234.ld.html">
162 Grundlagen's definition "t234"</a>
164 <a href="http://lambdadelta.info/static/lddl/crg_si/grundlagen/l/e/st/eq/landau/n/rt/rp/r/c/8283/t234.ld.html">
165 Grundlagen's definition "t234"</a>
166 (in "complete_rg" λδ).
170 <div xmlns:ld="http://lambdadelta.info/" class="head2sn" id="helena">
171 <img class="icon32" alt="[Helena logo]" title="Helena" src="http://lambdadelta.info/images/helena_32.png" /> Helena</div>
172 <div xmlns:ld="http://lambdadelta.info/" class="text">
173 Helena is a λδ processor,
174 implemented in <a href="http://caml.inria.fr/">Caml</a>
175 as a part of the <a href="http://helm.cs.unibo.it/">HELM</a> software,
176 meant for testing the stable features of the calculus as well as the unstable ones.
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179 The processor source code is available in the directory
180 <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>
181 of the <a href="http://helm.cs.unibo.it/software/index.html">HELM Svn repository</a>.
182 The Svn revisions containing the stable versions of Helena are indicated next.
184 <ul xmlns:ld="http://lambdadelta.info/">
186 <span class="date">Version 0.8.2.</span>
190 <ul xmlns:ld="http://lambdadelta.info/">
192 <span class="date">Version 0.8.1 (2010-11).</span>
193 Exploits a subset of "complete_rg" λδ as the intermediate language.
194 Features importation from ".hln" files containing λδ textual syntax.
195 The overall validation speed of the "Grundlagen der Analysis"
196 increases of 22% with respect to version 0.8.0.
197 [Svn revision: 11032] (<a href="http://lambdadelta.info/download/helena_0.8.1.tar.gz">archived source code</a>)
200 A <a href="http://www.jedsoft.org/jed/">Jed mode</a>
201 for editing ".hln" files (containing λδ textual syntax):
202 <a href="http://lambdadelta.info/download/helena.sl">helena.sl</a>
203 (revised <span class="date">2010-11</span>).
206 <span class="date">2009-12.</span>
207 Helena appears in F. Wiedijk's
208 <a href="http://www.cs.ru.nl/%7Efreek/digimath/index.html#helena">
209 index of computer math systems</a>.
214 <ul xmlns:ld="http://lambdadelta.info/">
216 <span class="date">Version 0.8.0 (2009-09).</span>
217 Supports "basic_rg" λδ with naive implementation of impredicative sort inclusion.
218 Features importation from <a href="http://www.win.tue.nl/automath/">Automath</a>
219 and exportation to <a href="http://www.w3.org/XML/">XML</a>.
220 <a href="http://lambdadelta.info/documentation.html#ldR4">Documentation (R4)</a>.
221 [Svn revision: 10304] (<a href="http://lambdadelta.info/download/helena_0.8.0.tar.gz">archived source code</a>).
224 A <a href="http://www.jedsoft.org/jed/">Jed mode</a>
225 for editing ".aut" files
226 (containing <a href="http://www.win.tue.nl/automath/">Automath</a> textual syntax):
227 <a href="http://lambdadelta.info/download/automath.sl">automath.sl</a>
228 (revised <span class="date">2008-07</span>).
231 <span class="date">2009-09.</span>
232 Jutting's specification of Landau's "Grundlagen der Analysis"
233 enters λδ Digital Library.
236 <span class="date">2009-06.</span>
237 Jutting's specification of Landau's "Grundlagen der Analysis"
238 is successfully processed, enabling sort inclusion.
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269 <div xmlns:ld="http://lambdadelta.info/" class="spacer">Last update: Sun, 10 Aug 2014 20:37:31 +0200</div>