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3 <html xmlns="http://www.w3.org/1999/xhtml" xmlns:ld="http://lambdadelta.info/" dir="ltr" lang="en-us"><head><meta http-equiv="Content-Language" content="en-us"/><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/><meta http-equiv="Content-Style-Type" content="text/css"/><meta name="author" content="Ferruccio Guidi"/><meta name="description" content="\lambda\delta home page"/><title>\lambda\delta home page</title><link rel="stylesheet" type="text/css" href="http://lambdadelta.info/css/ld_web.css"/><link rel="stylesheet" type="text/css" href="http://lambdadelta.info/css/lddl.css"/><link rel="stylesheet" type="text/css" href="http://lambdadelta.info/css/xhtbl.css"/><link rel="shortcut icon" href="http://lambdadelta.info/images/crux_16.ico"/></head><body lang="en-US"><div class="spacer"><a href="http://lambdadelta.info/"><img class="icon32" alt="[\lambda\delta home]" title="\lambda\delta home" src="http://lambdadelta.info/images/crux_32.png"/></a></div><div class="head1">The Formal Systems of the λδ (\lambda\delta) Family</div><div class="spacer"><img class="rule" alt="[Spacer]" title="\lambda\delta rainbow rule" src="http://lambdadelta.info/images/rainbow.png"/></div><div class="spacer"><br/></div><div class="text"><table cellpadding="4" cellspacing="0"><tbody><tr><td class="snns capitalize italic sky"><a href="http://lambdadelta.info/home.html">home</a></td><td class="snns capitalize italic magenta"><a href="http://lambdadelta.info/news.html">news</a></td><td class="snns capitalize italic white"><a href="http://lambdadelta.info/specification.html">specification</a></td><td class="snnn capitalize italic white"><br/></td><td class="snnn capitalize italic white"><br/></td><td class="snns capitalize italic orange"><a href="http://lambdadelta.info/documentation.html">documentation</a></td><td class="snns capitalize italic green"><a href="http://lambdadelta.info/implementation.html">implementation</a></td><td class="ssnn capitalize italic green"><br/></td></tr><tr><td class="snns capitalize sky"><a href="http://lambdadelta.info/home.html#foreword">foreword</a></td><td class="snns capitalize magenta"><a href="http://lambdadelta.info/news.html#milestones">milestones</a></td><td class="snns capitalize white"><a href="http://lambdadelta.info/specification.html#v2">version 2</a></td><td class="snnn capitalize white">(<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><td class="snnn capitalize white"><br/></td><td class="snns capitalize orange"><a href="http://lambdadelta.info/documentation.html#v2">version 2</a></td><td class="snns capitalize green"><a href="http://lambdadelta.info/implementation.html#helena">helena</a></td><td class="ssnn capitalize green"><a href="http://lambdadelta.info/osn/">Open Symbolic Notation (OSN)</a></td></tr><tr><td class="snss capitalize sky"><a href="http://lambdadelta.info/home.html#citations">citations</a></td><td class="snss capitalize magenta"><a href="http://lambdadelta.info/news.html#visibility">visibility</a></td><td class="snss capitalize white"><a href="http://lambdadelta.info/specification.html#v1">version 1</a></td><td class="snsn capitalize white">(<a href="http://lambdadelta.info/ground_1.html">background</a> - <a href="http://lambdadelta.info/basic_1.html">core</a>)</td><td class="snsn capitalize white">(<a href="http://lambdadelta.info/static/matita/lambdadelta/">static HELM directory</a>)</td><td class="snss capitalize orange"><a href="http://lambdadelta.info/documentation.html#v1">version 1</a></td><td class="snss capitalize green"><a href="http://lambdadelta.info/implementation.html#lddl">library</a></td><td class="sssn capitalize green">(<a href="http://lambdadelta.info/static/lddl/">static LDDL directory</a>)</td></tr></tbody></table></div><!-- ===================================================================== --><div class="head2dx" id="milestones">Milestones <img class="icon37" alt="[butterfly]" title="\lambda\delta butterfly" src="http://lambdadelta.info/images/b3.png"/></div><ul><li><span class="emph alpha">December 2015.</span><a href="http://lambdadelta.info/documentation.html#ldJ3a">Second journal paper on λδ</a>
4 accepted for publication.
5 </li></ul><ul><li><span class="emph gamma">December 2015.</span><a href="http://lambdadelta.info/implementation.html#v3">"Helena 0.8.3"</a> is released.
6 </li></ul><ul><li><span class="emph delta">August 2015.</span>
7 The specification of λδ version 2A1 is concluded.
8 </li></ul><ul><li><span class="emph gamma">June 2015.</span>
9 The corrected specification of Landau's "Grundlagen der Analysis"
10 is validated in a λProlog implementation of λδ version 3.
11 </li></ul><ul><li><span class="emph delta">March 2015.</span>
12 The specification of λδ version 1 is validated by
13 <a href="http://matita.cs.unibo.it/">Matita 0.99.2</a>.
14 </li></ul><ul><li><span class="emph gamma">February 2015.</span><a href="http://lambdadelta.info/implementation.html#v2">"Helena 0.8.2"</a> is updated.
16 The translated specification of Landau's "Grundlagen der Analysis"
17 is validated in CC by <a href="http://coq.inria.fr/">Coq 8.4.3</a>.
18 </li></ul></li></ul><ul><li><span class="emph delta">January 2015.</span>
19 The specification of <a href="http://lambdadelta.info/specification.html#v1">λδ version 1</a>
20 is updated with backports from the abandoned specification of λδ version 2.
21 </li></ul><ul><li><span class="emph gamma">December 2014.</span><a href="http://lambdadelta.info/implementation.html#v2">"Helena 0.8.2"</a> is released.
23 The corrected specification of Landau's "Grundlagen der Analysis"
24 is validated in λδ version 3.
25 </li></ul></li></ul><ul><li><span class="emph gamma">October 2014.</span><a href="http://lambdadelta.info/documentation.html#ldJ2a">λδ version 2A1</a>
27 </li></ul><ul><li><span class="emph beta">July 2014.</span>
28 A new version of this site is online.
29 </li></ul><ul><li><span class="emph beta">June 2014.</span><a href="http://lambdadelta.info/documentation.html#ldP2c">First communication on λδ version 2.</a></li></ul><ul><li><span class="emph alpha">December 2012.</span>
30 The character "_" is removed from the denomination "lambda_delta":
32 The denomination "\lambda\delta" is used in λδ-related texts.
34 The denomination "lambdadelta" is used in λδ-related identifiers.
36 Permanent λδ URL acquired:
37 <a href="http://lambdadelta.info/">http://lambdadelta.info/</a>
38 (pointing at this site).
39 </li></ul></li></ul><ul><li><span class="emph alpha">September 2011.</span>
40 The denomination "lambda-delta" changes to "lambda_delta":
42 The character "-" is reserved in λδ textual syntax
43 (recognized by "Helena 0.8.1").
45 Eventually, the occurrences of the character "-"
46 will be replaced by "_" in all λδ-related identifiers.
48 In particular, this refactoring involves file names and path names.
49 </li></ul></li></ul><ul><li><span class="emph alpha">April 2011.</span>
50 The specification of <a href="http://lambdadelta.info/specification.html#v2">λδ version 2</a>
51 and related topics is restarted in
52 <a href="http://matita.cs.unibo.it/">Matita 0.5</a>.
53 </li></ul><ul><li><span class="emph delta">February 2011.</span>
54 The specification of λδ version 2 with Coq 7.3.1 is abandoned.
55 </li></ul><ul><li><span class="emph alpha">December 2010.</span>
56 Transient λδ URL acquired: http://lambda-delta.info/ (expires on December 2012).
57 </li></ul><ul><li><span class="emph beta">November 2010.</span><a href="http://lambdadelta.info/implementation.html#v1">"Helena 0.8.1"</a> is released.
58 </li></ul><ul><li><span class="emph beta">September 2009.</span><a href="http://lambdadelta.info/implementation.html#v0">"Helena 0.8.0"</a> is released and the
59 <a href="http://lambdadelta.info/implementation.html#lddl">λδ Digital Library</a> is started.
60 </li></ul><ul><li><span class="emph alpha">June 2009.</span>
61 "Helena", a <a href="http://lambdadelta.info/implementation.html#helena">validator for λδ version 2</a>,
62 is available as a part of the <a href="http://helm.cs.unibo.it/">HELM</a> software.
63 </li></ul><ul><li><span class="emph alpha">September 2008.</span>
65 </li></ul><ul><li><span class="emph delta">July 2008.</span><a href="http://lambdadelta.info/documentation.html#ldJ1a">First journal paper on λδ</a>
66 accepted for publication.
67 </li></ul><ul><li><span class="emph delta">July 2008.</span>
68 First <a href="http://helm.cs.unibo.it/procedural/">procedural reconstruction</a>
69 for <a href="http://matita.cs.unibo.it/">Matita 0.5</a>
70 of the λδ version 1 for Coq 7.3.1.
71 </li></ul><ul><li><span class="emph delta">June 2008.</span>
72 The <a href="http://lambdadelta.info/specification.html#static1">
73 HTML pages of the specification of λδ version 1 for Matita 0.5</a>
75 </li></ul><ul><li><span class="emph delta">May 2008.</span>
76 The specification of λδ version 1 is concluded.
77 </li></ul><ul><li><span class="emph alpha">March 2008.</span>
78 The specification of λδ version 2 is started with Coq 7.3.1 (false start).
79 </li></ul><ul><li><span class="emph gamma">September 2007.</span>
80 The <a href="http://lambdadelta.info/specification.html#dynamic1">
81 specification of λδ version 1 for Matita 0.4</a>
83 </li></ul><ul><li><span class="emph gamma">November 2006.</span><a href="http://lambdadelta.info/documentation.html#ldR1b">λδ version 1</a>
85 </li></ul><ul><li><span class="emph beta">December 2005.</span><a href="http://lambdadelta.info/documentation.html#ldP1a">First communication on λδ version 1</a>.
86 </li></ul><ul><li><span class="emph alpha">May 2004.</span>
87 The specification of <a href="http://lambdadelta.info/specification.html#v1">λδ version 1</a>
88 is started with Coq 7.3.1.
89 </li></ul><!-- ===================================================================== --><div class="head2dx" id="visibility">Visibility <img class="icon37" alt="[butterfly]" title="\lambda\delta butterfly" src="http://lambdadelta.info/images/b3.png"/></div><ul><li><span class="emph alpha">June 2014.</span>
90 The <a href="http://www.google.com/">Google</a>
91 search for "formal system lambda delta" gives
92 5 resources about the λδ family in the first 6 results.
93 </li></ul><ul><li><span class="emph alpha">June 2014.</span>
94 The <a href="http://www.yahoo.com/">Yahoo</a>
95 search for "formal system lambda delta" gives
96 4 resources about the λδ family in the first 5 results.
97 </li></ul><div class="spacer"><img class="rule" alt="[Spacer]" title="\lambda\delta rainbow rule" src="http://lambdadelta.info/images/rainbow.png"/></div><div class="spacer"><br/></div><div class="spacer"><a href="http://validator.w3.org/check?uri=referer"><img class="w3c" alt="[Valid XHTML 1.1]" title="Valid XHTML 1.1" src="http://www.w3.org/Icons/valid-xhtml11-blue"/></a><a href="http://jigsaw.w3.org/css-validator/check/referer"><img class="w3c" alt="[Valid CSS level 2]" title="Valid CSS level 2" src="http://www.w3.org/Icons/valid-css2-blue"/></a><a href="http://www.w3.org/XML/"><img class="w3c" alt="[Generated from XML via XSL]" title="Generated from XML via XSL" src="http://lambdadelta.info/images/xml_xsl2.png"/></a><a href="http://www.w3.org/Graphics/PNG/"><img class="w3c" alt="[PNG used here]" title="PNG used here" src="http://lambdadelta.info/images/PNGnow2.png"/></a><a href="http://www.anybrowser.org/campaign/"><img class="w3c" alt="[Viewable with any browser]" title="Viewable with any browser" src="http://www.anybrowser.org/campaign/bvgraphics/abtfile.png"/></a></div><div class="spacer"><br/></div><div class="spacer">Last update: Thu, 09 Mar 2017 13:38:15 +0100</div></body></html>