helm/www/lambdadelta/news.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 capitalize italic sky">
  34               <a href="http://lambdadelta.info/index.html">home</a>
  35             </td>
  36             <td class="snns capitalize italic magenta">
  37               <a href="http://lambdadelta.info/news.html">news</a>
  38             </td>
  39             <td class="snns capitalize italic orange">
  40               <a href="http://lambdadelta.info/documentation.html">documentation</a>
  41             </td>
  42             <td class="snns capitalize italic green">
  43               <a href="http://lambdadelta.info/specification.html">specification</a>
  44             </td>
  45             <td class="snnn capitalize italic green">
  46               <br />
  47             </td>
  48             <td class="snnn capitalize italic green">
  49               <br />
  50             </td>
  51             <td class="snns capitalize italic green">
  52               <a href="http://lambdadelta.info/implementation.html">implementation</a>
  53             </td>
  54             <td class="ssnn capitalize italic green">
  55               <br />
  56             </td>
  57           </tr>
  58           <tr>
  59             <td class="snns capitalize sky">
  60               <a href="http://lambdadelta.info/index.html#foreword">foreword</a>
  61             </td>
  62             <td class="snns capitalize magenta">
  63               <a href="http://lambdadelta.info/news.html#milestones">milestones</a>
  64             </td>
  65             <td class="snns capitalize orange">
  66               <a href="http://lambdadelta.info/documentation.html#v2">version 2</a>
  67             </td>
  68             <td class="snns capitalize green">
  69               <a href="http://lambdadelta.info/specification.html#v2">version 2</a>
  70             </td>
  71             <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>
  72             <td class="snnn capitalize green">
  73               <br />
  74             </td>
  75             <td class="snns capitalize green">
  76               <a href="http://lambdadelta.info/implementation.html#lddl">library</a>
  77             </td>
  78             <td class="ssnn capitalize green">(<a href="http://lambdadelta.info/static/lddl/">static LDDL directory</a>)</td>
  79           </tr>
  80           <tr>
  81             <td class="snss capitalize sky">
  82               <a href="http://lambdadelta.info/index.html#citations">citations</a>
  83             </td>
  84             <td class="snss capitalize magenta">
  85               <a href="http://lambdadelta.info/news.html#visibility">visibility</a>
  86             </td>
  87             <td class="snss capitalize orange">
  88               <a href="http://lambdadelta.info/documentation.html#v1">version 1</a>
  89             </td>
  90             <td class="snss capitalize green">
  91               <a href="http://lambdadelta.info/specification.html#v1">version 1</a>
  92             </td>
  93             <td class="snsn capitalize green">(<a href="http://lambdadelta.info/basic_1.html">core</a>)</td>
  94             <td class="snsn capitalize green">(<a href="http://lambdadelta.info/static/matita/lambdadelta/">static HELM directory</a>)</td>
  95             <td class="snss capitalize green">
  96               <a href="http://lambdadelta.info/implementation.html#helena">helena</a>
  97             </td>
  98             <td class="sssn capitalize green">
  99               <br />
 100             </td>
 101           </tr>
 102         </tbody>
 103       </table>
 104     </div>
 105     <!-- ===================================================================== -->
 106     <div xmlns:ld="http://lambdadelta.info/" class="head2dx" id="milestones">Milestones <img class="icon37" alt="[spacer]" title="lambdadelta butterfly" src="http://lambdadelta.info/images/b3.png" />
 107     </div>
 108     <ul xmlns:ld="http://lambdadelta.info/">
 109       <li>
 110         <span class="emph delta">January 2015.</span>
 111       The specification of <a href="http://lambdadelta.info/specification.html#v1">λδ version 1</a>
 112       is updated with backports from the abandoned specification of λδ version 2.
 113    </li>
 114     </ul>
 115     <ul xmlns:ld="http://lambdadelta.info/">
 116       <li>
 117         <span class="emph gamma">December 2014.</span>
 118         <a href="http://lambdadelta.info/implementation.html#v2">"Helena 0.8.2"</a> is released.
 119       <ul>
 120           <li>
 121          The corrected specification of Landau's "Grundlagen der Analysis"
 122          is validated in λδ version 3.
 123       </li>
 124         </ul>
 125       </li>
 126     </ul>
 127     <ul xmlns:ld="http://lambdadelta.info/">
 128       <li>
 129         <span class="emph gamma">October 2014.</span>
 130         <a href="http://lambdadelta.info/documentation.html#ldJ2">λδ version 2A</a>
 131       is released.
 132    </li>
 133     </ul>
 134     <ul xmlns:ld="http://lambdadelta.info/">
 135       <li>
 136         <span class="emph beta">July 2014.</span>
 137       A new version of this site is online.
 138    </li>
 139     </ul>
 140     <ul xmlns:ld="http://lambdadelta.info/">
 141       <li>
 142         <span class="emph beta">June 2014.</span>
 143         <a href="http://lambdadelta.info/documentation.html#ldP8">First communication on λδ version 2.</a>
 144       </li>
 145     </ul>
 146     <ul xmlns:ld="http://lambdadelta.info/">
 147       <li>
 148         <span class="emph alpha">December 2012.</span>
 149       The character "_" is removed from the denomination "lambda_delta":
 150       <ul>
 151           <li>
 152          The denomination "\lambda\delta" is used in λδ-related texts.
 153       </li>
 154           <li>
 155          The denomination "lambdadelta" is used in λδ-related identifiers.
 156       </li>
 157           <li>
 158          Permanent λδ URL acquired:
 159          <a href="http://lambdadelta.info/">http://lambdadelta.info/</a>
 160          (pointing at this site).
 161       </li>
 162         </ul>
 163       </li>
 164     </ul>
 165     <ul xmlns:ld="http://lambdadelta.info/">
 166       <li>
 167         <span class="emph alpha">September 2011.</span>
 168       The denomination "lambda-delta" changes to "lambda_delta":
 169       <ul>
 170           <li>
 171          The character "-" is reserved in λδ textual syntax
 172          (recognized by "Helena 0.8.1").
 173       </li>
 174           <li>
 175          Eventually, the occurrences of the character "-"
 176          will be replaced by "_" in all λδ-related identifiers.
 177       </li>
 178           <li>
 179          In particular, this refactoring involves file names and path names.
 180       </li>
 181         </ul>
 182       </li>
 183     </ul>
 184     <ul xmlns:ld="http://lambdadelta.info/">
 185       <li>
 186         <span class="emph alpha">April 2011.</span>
 187       The specification of <a href="http://lambdadelta.info/specification.html#v2">λδ version 2</a>
 188       and related topics is restarted in
 189       <a href="http://matita.cs.unibo.it/">Matita 0.5</a>.
 190    </li>
 191     </ul>
 192     <ul xmlns:ld="http://lambdadelta.info/">
 193       <li>
 194         <span class="emph delta">February 2011.</span>
 195       The specification of λδ version 2 with Coq 7.3.1 is abandoned.
 196    </li>
 197     </ul>
 198     <ul xmlns:ld="http://lambdadelta.info/">
 199       <li>
 200         <span class="emph alpha">December 2010.</span>
 201       Transient λδ URL acquired: http://lambda-delta.info/ (expires on December 2012).
 202    </li>
 203     </ul>
 204     <ul xmlns:ld="http://lambdadelta.info/">
 205       <li>
 206         <span class="emph beta">November 2010.</span>
 207         <a href="http://lambdadelta.info/implementation.html#v1">"Helena 0.8.1"</a> is released.
 208    </li>
 209     </ul>
 210     <ul xmlns:ld="http://lambdadelta.info/">
 211       <li>
 212         <span class="emph beta">September 2009.</span>
 213         <a href="http://lambdadelta.info/implementation.html#v0">"Helena 0.8.0"</a> is released and the
 214       <a href="http://lambdadelta.info/implementation.html#lddl">λδ Digital Library</a> is started.
 215    </li>
 216     </ul>
 217     <ul xmlns:ld="http://lambdadelta.info/">
 218       <li>
 219         <span class="emph alpha">June 2009.</span>
 220       "Helena", a <a href="http://lambdadelta.info/implementation.html#helena">validator for λδ version 2</a>,
 221       is available as a part of the <a href="http://helm.cs.unibo.it/">HELM</a> software.
 222    </li>
 223     </ul>
 224     <ul xmlns:ld="http://lambdadelta.info/">
 225       <li>
 226         <span class="emph alpha">September 2008.</span>
 227       This site is online.
 228    </li>
 229     </ul>
 230     <ul xmlns:ld="http://lambdadelta.info/">
 231       <li>
 232         <span class="emph delta">July 2008.</span>
 233         <a href="http://lambdadelta.info/documentation.html#ldJ1">First journal paper on λδ</a>
 234       accepted for publication.
 235    </li>
 236     </ul>
 237     <ul xmlns:ld="http://lambdadelta.info/">
 238       <li>
 239         <span class="emph delta">July 2008.</span>
 240       First <a href="http://helm.cs.unibo.it/procedural/">procedural reconstruction</a>
 241       for <a href="http://matita.cs.unibo.it/">Matita 0.5</a>
 242       of the λδ version 1 for Coq 7.3.1.
 243    </li>
 244     </ul>
 245     <ul xmlns:ld="http://lambdadelta.info/">
 246       <li>
 247         <span class="emph delta">June 2008.</span>
 248       The <a href="http://lambdadelta.info/specification.html#static1">
 249          HTML pages of the specification of λδ version 1 for Matita 0.5</a>
 250       are online.
 251    </li>
 252     </ul>
 253     <ul xmlns:ld="http://lambdadelta.info/">
 254       <li>
 255         <span class="emph delta">May 2008.</span>
 256       The specification of λδ version 1 is concluded.
 257    </li>
 258     </ul>
 259     <ul xmlns:ld="http://lambdadelta.info/">
 260       <li>
 261         <span class="emph alpha">March 2008.</span>
 262       The specification of λδ version 2 is started with Coq 7.3.1 (false start).
 263    </li>
 264     </ul>
 265     <ul xmlns:ld="http://lambdadelta.info/">
 266       <li>
 267         <span class="emph gamma">September 2007.</span>
 268       The <a href="http://lambdadelta.info/specification.html#dynamic1">
 269          specification of λδ version 1 for Matita 0.4</a>
 270       is online.
 271    </li>
 272     </ul>
 273     <ul xmlns:ld="http://lambdadelta.info/">
 274       <li>
 275         <span class="emph gamma">November 2006.</span>
 276         <a href="http://lambdadelta.info/documentation.html#ldR2">λδ version 1</a>
 277       is released.
 278    </li>
 279     </ul>
 280     <ul xmlns:ld="http://lambdadelta.info/">
 281       <li>
 282         <span class="emph beta">December 2005.</span>
 283         <a href="http://lambdadelta.info/documentation.html#ldP1">First communication on λδ version 1</a>.
 284    </li>
 285     </ul>
 286     <ul xmlns:ld="http://lambdadelta.info/">
 287       <li>
 288         <span class="emph alpha">May 2004.</span>
 289       The specification of <a href="http://lambdadelta.info/specification.html#v1">λδ version 1</a>
 290       is started with Coq 7.3.1.
 291    </li>
 292     </ul>
 293     <!-- ===================================================================== -->
 294     <div xmlns:ld="http://lambdadelta.info/" class="head2dx" id="visibility">Visibility <img class="icon37" alt="[spacer]" title="lambdadelta butterfly" src="http://lambdadelta.info/images/b3.png" />
 295     </div>
 296     <ul xmlns:ld="http://lambdadelta.info/">
 297       <li>
 298         <span class="emph alpha">June 2014.</span>
 299       The <a href="http://www.google.com/">Google</a>
 300       search for "formal system lambda delta" gives
 301       5 resources about λδ in the first 6 results.
 302    </li>
 303     </ul>
 304     <ul xmlns:ld="http://lambdadelta.info/">
 305       <li>
 306         <span class="emph alpha">June 2014.</span>
 307       The <a href="http://www.yahoo.com/">Yahoo</a>
 308       search for "formal system lambda delta" gives
 309       4 resources about λδ in the first 5 results.
 310    </li>
 311     </ul>
 312     <div class="spacer">
 313       <img class="rule" alt="[Spacer]" title="lambdadelta rainbow rule" src="http://lambdadelta.info/images/rainbow.png" />
 314     </div>
 315     <div xmlns:ld="http://lambdadelta.info/" class="spacer">
 316       <br />
 317     </div>
 318     <div xmlns:ld="http://lambdadelta.info/" class="spacer">
 319       <a href="http://validator.w3.org/check?uri=referer">
 320         <img class="w3c" alt="[Valid XHTML 1.1]" title="Valid XHTML 1.1" src="http://www.w3.org/Icons/valid-xhtml11-blue" />
 321       </a>
 322       <a href="http://jigsaw.w3.org/css-validator/check/referer">
 323         <img class="w3c" alt="[Valid CSS level 2]" title="Valid CSS level 2" src="http://www.w3.org/Icons/valid-css2-blue" />
 324       </a>
 325       <a href="http://www.w3.org/XML/">
 326         <img class="w3c" alt="[Generated from XML via XSL]" title="Generated from XML via XSL" src="http://lambdadelta.info/images/xml_xsl2.png" />
 327       </a>
 328       <a href="http://www.w3.org/Graphics/PNG/">
 329         <img class="w3c" alt="[PNG used here]" title="PNG used here" src="http://lambdadelta.info/images/PNGnow2.png" />
 330       </a>
 331       <a href="http://www.anybrowser.org/campaign/">
 332         <img class="w3c" alt="[Viewable with any browser]" title="Viewable with any browser" src="http://www.anybrowser.org/campaign/bvgraphics/abtfile.png" />
 333       </a>
 334     </div>
 335     <div xmlns:ld="http://lambdadelta.info/" class="spacer">
 336       <br />
 337     </div>
 338     <div xmlns:ld="http://lambdadelta.info/" class="spacer">Last update: Tue, 20 Jan 2015 18:38:59 +0100</div>
 339   </body>
 340 </html>