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  22     <div class="head1">The Formal System λδ (\lambda\delta)</div>
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  34               <a href="http://lambdadelta.info/index.html">foreword</a>
  35             </td>
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  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>
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  43               <a href="http://lambdadelta.info/implementation.html">implementation</a>
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  65             <td class="snns green">
  66               <a href="http://lambdadelta.info/version_2.html">Version 2</a>
  67             </td>
  68             <td class="snnn green">
  69               <a href="http://lambdadelta.info/ground_2.html">Background</a>
  70             </td>
  71             <td class="snnn green">
  72               <a href="http://lambdadelta.info/basic_2.html">Core</a>
  73             </td>
  74             <td class="ssnn green">
  75               <a href="http://lambdadelta.info/apps_2.html">Applications</a>
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  87             </td>
  88             <td class="snss green">
  89               <a href="http://lambdadelta.info/version_1.html">Version 1</a>
  90             </td>
  91             <td class="snsn green">
  92               <br />
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 101         </tbody>
 102       </table>
 103     </div>
 104
 105    <div xmlns:ld="http://lambdadelta.info/" class="head2dx" id="milestones">Milestones <img class="icon37" alt="[spacer]" title="lambdadelta butterfly" src="http://lambdadelta.info/images/b5.png" />
 106     </div>
 107    <div xmlns:ld="http://lambdadelta.info/" class="text">
 108       <ul>
 109         <li>
 110           <span class="date">June 2014.</span>
 111          <a href="http://lambdadelta.info/documentation.html#ldt8">First communication on λδ version 2.</a>
 112       </li>
 113       </ul>
 114       <ul>
 115         <li>
 116           <span class="date">December 2012.</span>
 117          The character "_" is removed from the denomination "lambda_delta":
 118          <ul>
 119             <li>
 120                The denomination "\lambda\delta" is used in λδ-related texts.
 121             </li>
 122             <li>
 123                The denomination "lambdadelta" is used in λδ-related identifiers.
 124             </li>
 125             <li>
 126               Permanent λδ URL acquired:
 127               <a href="http://lambdadelta.info/">http://lambdadelta.info/</a>
 128               (pointing at this site).
 129             </li>
 130          </ul>
 131       </li>
 132       </ul>
 133       <ul>
 134         <li>
 135           <span class="date">September 2011.</span>
 136          The denomination "lambda-delta" changes to "lambda_delta":
 137          <ul>
 138             <li>
 139                The character "-" is reserved in λδ textual syntax
 140                (recognized by "Helena 0.8.1").
 141             </li>
 142             <li>
 143                Eventually, the occurrences of the character "-"
 144                will be replaced by "_" in all λδ-related identifiers.
 145             </li>
 146             <li>
 147                In particular, this refactoring involves file names and path names.
 148             </li>
 149          </ul>
 150       </li>
 151       </ul>
 152       <ul>
 153         <li>
 154           <span class="date">April 2011.</span>
 155          The specification of <a href="http://lambdadelta.info/version_2.html">λδ version 2</a>
 156          and related topics is restarted in
 157          <a href="http://matita.cs.unibo.it/">Matita 0.5</a>.
 158       </li>
 159       </ul>
 160       <ul>
 161         <li>
 162           <span class="date">December 2010.</span>
 163          Transient λδ URL acquired: http://lambda-delta.info/ (expires on December 2012).
 164       </li>
 165       </ul>
 166       <ul>
 167         <li>
 168           <span class="date">November 2010.</span>
 169          "Helena 0.8.1" is released.
 170       </li>
 171       </ul>
 172       <ul>
 173         <li>
 174           <span class="date">September 2009.</span>
 175          "Helena 0.8.0" is released and the
 176          <a href="http://lambdadelta.info/implementation.html#lddl">λδ Digital Library</a>
 177          is started.
 178       </li>
 179       </ul>
 180       <ul>
 181         <li>
 182           <span class="date">June 2009.</span>
 183          "Helena", a <a href="http://lambdadelta.info/implementation.html#helena">validator for λδ version 2</a>,
 184          is available as a part of the <a href="http://helm.cs.unibo.it/">HELM</a> software.
 185       </li>
 186       </ul>
 187       <ul>
 188         <li>
 189           <span class="date">September 2008.</span>
 190          This site is online.
 191       </li>
 192       </ul>
 193       <ul>
 194         <li>
 195           <span class="date">July 2008.</span>
 196          <a href="http://lambdadelta.info/documentation.html#ldp5">First journal paper on λδ</a>
 197          accepted for publication.
 198       </li>
 199       </ul>
 200       <ul>
 201         <li>
 202           <span class="date">July 2008.</span>
 203          First <a href="http://helm.cs.unibo.it/procedural/">procedural reconstruction</a>
 204          for <a href="http://matita.cs.unibo.it/">Matita 0.5</a>
 205          of the λδ version 1 for Coq 7.3.1.
 206       </li>
 207       </ul>
 208       <ul>
 209         <li>
 210           <span class="date">June 2008.</span>
 211          The <a href="http://lambdadelta.info/version_1.html#static">
 212             HTML pages of the specification of λδ version 1 for Matita 0.5</a>
 213          are online.
 214       </li>
 215       </ul>
 216       <ul>
 217         <li>
 218           <span class="date">May 2008.</span>
 219          The specification of λδ version 1 is dismissed.
 220       </li>
 221       </ul>
 222       <ul>
 223         <li>
 224           <span class="date">March 2008.</span>
 225          The specification of λδ version 2 is started with Coq 7.3.1 (false start).
 226       </li>
 227       </ul>
 228       <ul>
 229         <li>
 230           <span class="date">September 2007.</span>
 231          The <a href="http://lambdadelta.info/version_1.html#dynamic">
 232             specification of λδ version 1 for Matita 0.4</a>
 233          is online.
 234       </li>
 235       </ul>
 236       <ul>
 237         <li>
 238           <span class="date">November 2006.</span>
 239          <a href="http://lambdadelta.info/documentation.html#ldp3">λδ version 1</a>
 240          is released.
 241       </li>
 242       </ul>
 243       <ul>
 244         <li>
 245           <span class="date">December 2005.</span>
 246          <a href="http://lambdadelta.info/documentation.html#ldt1">First communication on λδ</a>.
 247       </li>
 248       </ul>
 249       <ul>
 250         <li>
 251           <span class="date">May 2004.</span>
 252          The specification of <a href="http://lambdadelta.info/version_1.html">λδ version 1</a>
 253          is started with Coq 7.3.1.
 254       </li>
 255       </ul>
 256    </div>
 257
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 259     </div>
 260    <div xmlns:ld="http://lambdadelta.info/" class="text">
 261       <ul>
 262         <li>
 263           <span class="date">June 2014.</span>
 264          The <a href="http://www.google.com/">Google</a>
 265          search for "formal system lambda delta" gives
 266          5 resources about λδ in the first 6 results.
 267       </li>
 268       </ul>
 269       <ul>
 270         <li>
 271           <span class="date">June 2014.</span>
 272          The <a href="http://www.yahoo.com/">Yahoo</a>
 273          search for "formal system lambda delta" gives
 274          4 resources about λδ in the first 5 results.
 275       </li>
 276       </ul>
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 305     <div xmlns:ld="http://lambdadelta.info/" class="spacer">Last update: Sun, 13 Jul 2014 15:59:00 +0200</div>
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