helm/www/lambdadelta/index.html

   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">
   4   <head>
   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" />
  15   </head>
  16   <body lang="en-US">
  17     <div class="spacer">
  18       <a href="http://lambdadelta.info/">
  19         <img class="icon32" alt="[lambdadelta home]" title="lambdadelta home" src="http://lambdadelta.info/images/crux_32.png" />
  20       </a>
  21     </div>
  22     <div class="head1">The Formal System λδ (\lambda\delta)</div>
  23     <div class="spacer">
  24       <img class="rule" alt="[Spacer]" title="lambdadelta rainbow rule" src="http://lambdadelta.info/images/rainbow.png" />
  25     </div>
  26    <div xmlns:ld="http://lambdadelta.info/" class="spacer">
  27       <br />
  28     </div>
  29     <div xmlns:ld="http://lambdadelta.info/" class="text">
  30       <table cellpadding="4" cellspacing="0">
  31         <tbody>
  32           <tr>
  33             <td class="snns component sky">
  34               <a href="http://lambdadelta.info/index.html">home</a>
  35             </td>
  36             <td class="snns component magenta">
  37               <a href="http://lambdadelta.info/news.html">news</a>
  38             </td>
  39             <td class="snns component orange">
  40               <a href="http://lambdadelta.info/documentation.html">documentation</a>
  41             </td>
  42             <td class="snns component green">
  43               <a href="http://lambdadelta.info/implementation.html">implementation</a>
  44             </td>
  45             <td class="ssnn component green">
  46               <br />
  47             </td>
  48           </tr>
  49           <tr>
  50             <td class="snns sky">
  51               <a href="http://lambdadelta.info/index.html#foreword">Foreword</a>
  52             </td>
  53             <td class="snns magenta">
  54               <a href="http://lambdadelta.info/news.html#milestones">Milestones</a>
  55             </td>
  56             <td class="snns orange">
  57               <a href="http://lambdadelta.info/documentation.html#v2">Version 2</a>
  58             </td>
  59             <td class="snns green">
  60               <a href="http://lambdadelta.info/version_2.html">Version 2</a>
  61             </td>
  62             <td class="ssnn green">
  63               <a href="http://lambdadelta.info/ground_2.html">Background</a>
  64               <a href="http://lambdadelta.info/basic_2.html">Core</a>
  65               <a href="http://lambdadelta.info/apps_2.html">Applications</a>
  66             </td>
  67           </tr>
  68           <tr>
  69             <td class="snss sky">
  70               <a href="http://lambdadelta.info/index.html#notice">Notice</a>
  71             </td>
  72             <td class="snss magenta">
  73               <a href="http://lambdadelta.info/news.html#visibility">Visibility</a>
  74             </td>
  75             <td class="snss orange">
  76               <a href="http://lambdadelta.info/documentation.html#v1">Version 1</a>
  77             </td>
  78             <td class="snss green">
  79               <a href="http://lambdadelta.info/version_1.html">Version 1</a>
  80             </td>
  81             <td class="sssn green">
  82               <br />
  83             </td>
  84           </tr>
  85         </tbody>
  86       </table>
  87     </div>
  88
  89    <div xmlns:ld="http://lambdadelta.info/" class="head2dx" id="foreword">Foreword <img class="icon37" alt="[spacer]" title="lambdadelta butterfly" src="http://lambdadelta.info/images/b9.png" />
  90     </div>
  91    <div xmlns:ld="http://lambdadelta.info/" class="text">
  92       The formal system λδ (\lambda\delta) is a typed λ-calculus aiming to support
  93       the foundations of Mathematics that require an underlying specification language
  94       (for example the <a href="http://www.math.unipd.it/~maietti/">Minimal Type Theory</a>
  95        and its predecessors).
  96    </div>
  97    <div xmlns:ld="http://lambdadelta.info/" class="text">
  98       λδ is developed in the context of the
  99       <a href="http://helm.cs.unibo.it/">Hypertextual Electronic Library of Mathematics</a>
 100       as a machine-checked digital specification
 101       that is not the formal counterpart of some previously published informal material.
 102    </div>
 103    <div xmlns:ld="http://lambdadelta.info/" class="text">
 104       λδ comes in several versions listed in the following table,
 105       which includes the major milestones:
 106    </div>
 107    <div xmlns:ld="http://lambdadelta.info/" class="text">
 108       <table cellpadding="4" cellspacing="0">
 109         <tbody>
 110           <tr>
 111             <td class="snns component gray">version</td>
 112             <td class="snnn component gray">name</td>
 113             <td class="snnn component gray">developed with</td>
 114             <td class="snnn component gray">started</td>
 115             <td class="snnn component gray">announced</td>
 116             <td class="snnn component gray">released</td>
 117             <td class="ssnn component gray">dismissed</td>
 118           </tr>
 119           <tr>
 120             <td class="snns orange">2</td>
 121             <td class="snnn orange">
 122               <a href="http://lambdadelta.info/version_2.html">basic_2</a>
 123             </td>
 124             <td class="snnn orange">
 125               <a href="http://matita.cs.unibo.it/">Matita 0.99.2</a>
 126             </td>
 127             <td class="snnn orange">April 2011</td>
 128             <td class="snnn orange">July 2014</td>
 129             <td class="snnn orange">Planned in 2014</td>
 130             <td class="ssnn orange">Not planned yet</td>
 131           </tr>
 132           <tr>
 133             <td class="snss red">1</td>
 134             <td class="snsn red">
 135               <a href="http://lambdadelta.info/version_1.html">basic_1</a>
 136             </td>
 137             <td class="snsn red">
 138               <a href="http://coq.inria.fr/">Coq 7.3.1</a>
 139             </td>
 140             <td class="snsn red">May 2004</td>
 141             <td class="snsn red">January 2006</td>
 142             <td class="snsn red">November 2006</td>
 143             <td class="sssn red">May 2008</td>
 144           </tr>
 145         </tbody>
 146       </table>
 147     </div>
 148    <div xmlns:ld="http://lambdadelta.info/" class="text">
 149       This is the System logo: <a href="http://lambdadelta.info/images/crux_177.png">crux_177.png</a>
 150       (revised <span class="date">2012-09</span>).
 151    </div>
 152
 153    <div xmlns:ld="http://lambdadelta.info/" class="head2dx" id="notice">Notice for the Internet Explorer user <img class="icon37" alt="[spacer]" title="lambdadelta butterfly" src="http://lambdadelta.info/images/b3.png" />
 154     </div>
 155    <div xmlns:ld="http://lambdadelta.info/" class="text">
 156       To view this site correctly, please select a font
 157       with <a href="http://www.unicode.org/">Unicode</a> support.
 158       For example "Lucida Sans Unicode" (it should be already installed on your system).
 159       To change the current font follow:
 160       "Tools" menu → "Internet Options" entry → "General" tab → "Fonts" button.
 161    </div>
 162
 163    <div class="spacer">
 164       <img class="rule" alt="[Spacer]" title="lambdadelta rainbow rule" src="http://lambdadelta.info/images/rainbow.png" />
 165     </div>
 166     <div xmlns:ld="http://lambdadelta.info/" class="spacer">
 167       <br />
 168     </div>
 169     <div xmlns:ld="http://lambdadelta.info/" class="spacer">
 170       <a href="http://validator.w3.org/check?uri=referer">
 171         <img class="w3c" alt="[Valid XHTML 1.1]" title="Valid XHTML 1.1" src="http://www.w3.org/Icons/valid-xhtml11-blue" />
 172       </a>
 173       <a href="http://jigsaw.w3.org/css-validator/check/referer">
 174         <img class="w3c" alt="[Valid CSS level 2]" title="Valid CSS level 2" src="http://www.w3.org/Icons/valid-css2-blue" />
 175       </a>
 176       <a href="http://www.w3.org/XML/">
 177         <img class="w3c" alt="[Generated from XML via XSL]" title="Generated from XML via XSL" src="http://lambdadelta.info/images/xml_xsl2.png" />
 178       </a>
 179       <a href="http://www.w3.org/Graphics/PNG/">
 180         <img class="w3c" alt="[PNG used here]" title="PNG used here" src="http://lambdadelta.info/images/PNGnow2.png" />
 181       </a>
 182       <a href="http://www.anybrowser.org/campaign/">
 183         <img class="w3c" alt="[Viewable with any browser]" title="Viewable with any browser" src="http://www.anybrowser.org/campaign/bvgraphics/abtfile.png" />
 184       </a>
 185     </div>
 186     <div xmlns:ld="http://lambdadelta.info/" class="spacer">
 187       <br />
 188     </div>
 189     <div xmlns:ld="http://lambdadelta.info/" class="spacer">Last update: Sun, 20 Jul 2014 11:29:55 +0200</div>
 190 </body>
 191 </html>