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  22     <div class="head1">The Formal System λδ (\lambda\delta)</div>
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  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="ssns capitalize italic green">
  49               <a href="http://lambdadelta.info/implementation.html">implementation</a>
  50             </td>
  51           </tr>
  52           <tr>
  53             <td class="snns capitalize sky">
  54               <a href="http://lambdadelta.info/index.html#foreword">foreword</a>
  55             </td>
  56             <td class="snns capitalize magenta">
  57               <a href="http://lambdadelta.info/news.html#milestones">milestones</a>
  58             </td>
  59             <td class="snns capitalize orange">
  60               <a href="http://lambdadelta.info/documentation.html#v2">version 2</a>
  61             </td>
  62             <td class="snns capitalize green">
  63               <a href="http://lambdadelta.info/specification.html#v2">version 2</a>
  64             </td>
  65             <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>
  66             <td class="ssns capitalize green">
  67               <a href="http://lambdadelta.info/implementation.html#lddl">library</a>
  68             </td>
  69           </tr>
  70           <tr>
  71             <td class="snss capitalize sky">
  72               <a href="http://lambdadelta.info/index.html#notice">notice</a>
  73             </td>
  74             <td class="snss capitalize magenta">
  75               <a href="http://lambdadelta.info/news.html#citations">citations</a>
  76             </td>
  77             <td class="snss capitalize orange">
  78               <a href="http://lambdadelta.info/documentation.html#v1">version 1</a>
  79             </td>
  80             <td class="snss capitalize green">
  81               <a href="http://lambdadelta.info/specification.html#v1">version 1</a>
  82             </td>
  83             <td class="snsn capitalize green">
  84               <br />
  85             </td>
  86             <td class="ssss capitalize green">
  87               <a href="http://lambdadelta.info/implementation.html#helena">helena</a>
  88             </td>
  89           </tr>
  90         </tbody>
  91       </table>
  92     </div>
  93
  94
  95
  96    <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" />
  97     </div>
  98
  99    <ul xmlns:ld="http://lambdadelta.info/">
 100       <li>
 101         <span class="date">July 2014.</span>
 102       A new version of this site is online.
 103    </li>
 104     </ul>
 105
 106    <ul xmlns:ld="http://lambdadelta.info/">
 107       <li>
 108         <span class="date">June 2014.</span>
 109       <a href="http://lambdadelta.info/documentation.html#ldP8">First communication on λδ version 2.</a>
 110    </li>
 111     </ul>
 112
 113    <ul xmlns:ld="http://lambdadelta.info/">
 114       <li>
 115         <span class="date">December 2012.</span>
 116       The character "_" is removed from the denomination "lambda_delta":
 117       <ul>
 118           <li>
 119          The denomination "\lambda\delta" is used in λδ-related texts.
 120       </li>
 121           <li>
 122          The denomination "lambdadelta" is used in λδ-related identifiers.
 123       </li>
 124           <li>
 125          Permanent λδ URL acquired:
 126          <a href="http://lambdadelta.info/">http://lambdadelta.info/</a>
 127          (pointing at this site).
 128       </li>
 129         </ul>
 130    </li>
 131     </ul>
 132
 133    <ul xmlns:ld="http://lambdadelta.info/">
 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
 153    <ul xmlns:ld="http://lambdadelta.info/">
 154       <li>
 155         <span class="date">April 2011.</span>
 156       The specification of <a href="http://lambdadelta.info/version_2.html">λδ version 2</a>
 157       and related topics is restarted in
 158       <a href="http://matita.cs.unibo.it/">Matita 0.5</a>.
 159    </li>
 160     </ul>
 161
 162    <ul xmlns:ld="http://lambdadelta.info/">
 163       <li>
 164         <span class="date">December 2010.</span>
 165       Transient λδ URL acquired: http://lambda-delta.info/ (expires on December 2012).
 166    </li>
 167     </ul>
 168
 169    <ul xmlns:ld="http://lambdadelta.info/">
 170       <li>
 171         <span class="date">November 2010.</span>
 172       "Helena 0.8.1" is released.
 173    </li>
 174     </ul>
 175
 176    <ul xmlns:ld="http://lambdadelta.info/">
 177       <li>
 178         <span class="date">September 2009.</span>
 179       "Helena 0.8.0" is released and the
 180       <a href="http://lambdadelta.info/implementation.html#lddl">λδ Digital Library</a>
 181       is started.
 182    </li>
 183     </ul>
 184
 185    <ul xmlns:ld="http://lambdadelta.info/">
 186       <li>
 187         <span class="date">June 2009.</span>
 188       "Helena", a <a href="http://lambdadelta.info/implementation.html#helena">validator for λδ version 2</a>,
 189       is available as a part of the <a href="http://helm.cs.unibo.it/">HELM</a> software.
 190    </li>
 191     </ul>
 192
 193    <ul xmlns:ld="http://lambdadelta.info/">
 194       <li>
 195         <span class="date">September 2008.</span>
 196       This site is online.
 197    </li>
 198     </ul>
 199
 200    <ul xmlns:ld="http://lambdadelta.info/">
 201       <li>
 202         <span class="date">July 2008.</span>
 203       <a href="http://lambdadelta.info/documentation.html#ldJ1">First journal paper on λδ</a>
 204       accepted for publication.
 205    </li>
 206     </ul>
 207
 208    <ul xmlns:ld="http://lambdadelta.info/">
 209       <li>
 210         <span class="date">July 2008.</span>
 211       First <a href="http://helm.cs.unibo.it/procedural/">procedural reconstruction</a>
 212       for <a href="http://matita.cs.unibo.it/">Matita 0.5</a>
 213       of the λδ version 1 for Coq 7.3.1.
 214    </li>
 215     </ul>
 216
 217    <ul xmlns:ld="http://lambdadelta.info/">
 218       <li>
 219         <span class="date">June 2008.</span>
 220       The <a href="http://lambdadelta.info/version_1.html#static">
 221          HTML pages of the specification of λδ version 1 for Matita 0.5</a>
 222       are online.
 223    </li>
 224     </ul>
 225
 226    <ul xmlns:ld="http://lambdadelta.info/">
 227       <li>
 228         <span class="date">May 2008.</span>
 229       The specification of λδ version 1 is dismissed.
 230    </li>
 231     </ul>
 232
 233    <ul xmlns:ld="http://lambdadelta.info/">
 234       <li>
 235         <span class="date">March 2008.</span>
 236       The specification of λδ version 2 is started with Coq 7.3.1 (false start).
 237    </li>
 238     </ul>
 239
 240    <ul xmlns:ld="http://lambdadelta.info/">
 241       <li>
 242         <span class="date">September 2007.</span>
 243       The <a href="http://lambdadelta.info/version_1.html#dynamic">
 244          specification of λδ version 1 for Matita 0.4</a>
 245       is online.
 246    </li>
 247     </ul>
 248
 249    <ul xmlns:ld="http://lambdadelta.info/">
 250       <li>
 251         <span class="date">November 2006.</span>
 252       <a href="http://lambdadelta.info/documentation.html#ldR2">λδ version 1</a>
 253       is released.
 254    </li>
 255     </ul>
 256
 257    <ul xmlns:ld="http://lambdadelta.info/">
 258       <li>
 259         <span class="date">December 2005.</span>
 260       <a href="http://lambdadelta.info/documentation.html#ldP1">First communication on λδ version 1</a>.
 261    </li>
 262     </ul>
 263
 264    <ul xmlns:ld="http://lambdadelta.info/">
 265       <li>
 266         <span class="date">May 2004.</span>
 267       The specification of <a href="http://lambdadelta.info/version_1.html">λδ version 1</a>
 268       is started with Coq 7.3.1.
 269    </li>
 270     </ul>
 271
 272
 273
 274    <div xmlns:ld="http://lambdadelta.info/" class="head2dx" id="citations">Citations <img class="icon37" alt="[spacer]" title="lambdadelta butterfly" src="http://lambdadelta.info/images/b3.png" />
 275     </div>
 276    <div xmlns:ld="http://lambdadelta.info/" class="text">
 277       This is a list of publications citing λδ (not including our own).
 278    </div>
 279
 280    <ul xmlns:ld="http://lambdadelta.info/" id="C6">
 281       <li>
 282       A. Asperti, W. Ricciotti, C. Sacerdoti Coen, E. Tassi:
 283       <span class="date">Formal metatheory of programming languages in the Matita interactive theorem prover</span>
 284       (2012). In JAR 49(3), pp. 427-451.
 285    </li>
 286     </ul>
 287
 288    <ul xmlns:ld="http://lambdadelta.info/" id="C5">
 289       <li>
 290       M.E. Maietti:
 291       <span class="date">Consistency of the minimalist foundation with Church thesis and Bar Induction</span>
 292       (2012). Submitted article.
 293    </li>
 294     </ul>
 295
 296    <ul xmlns:ld="http://lambdadelta.info/" id="C4">
 297       <li>
 298       W. Ricciotti:
 299       <span class="date">Theoretical and implementation aspects in the mechanization of the metatheory of programming languages</span>
 300       (July 2011). Ph.D. Thesis in Computer Science, Technical Report UBLCS-2011-09, University of Bologna.
 301    </li>
 302     </ul>
 303
 304    <ul xmlns:ld="http://lambdadelta.info/" id="C3">
 305       <li>
 306       C.E. Brown:
 307       <span class="date">Faithful Reproductions of the Automath Landau Formalization</span>
 308       (2011). Typescript note.
 309    </li>
 310     </ul>
 311
 312    <ul xmlns:ld="http://lambdadelta.info/" id="C2">
 313       <li>
 314       M.E. Maietti:
 315       <span class="date">A minimalist two-level foundation for constructive mathematics</span>
 316       (2009). In APAL 160(3), pp. 319-354.
 317    </li>
 318     </ul>
 319
 320    <ul xmlns:ld="http://lambdadelta.info/" id="C1">
 321       <li>
 322       V. Rahili:
 323       <span class="date">First Year Report: Realisability methods of proof and semantics with application to expansion</span>
 324       (July 2007). Typescript note.
 325    </li>
 326     </ul>
 327
 328
 329
 330    <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" />
 331     </div>
 332
 333    <ul xmlns:ld="http://lambdadelta.info/">
 334       <li>
 335         <span class="date">June 2014.</span>
 336       The <a href="http://www.google.com/">Google</a>
 337       search for "formal system lambda delta" gives
 338       5 resources about λδ in the first 6 results.
 339    </li>
 340     </ul>
 341
 342    <ul xmlns:ld="http://lambdadelta.info/">
 343       <li>
 344         <span class="date">June 2014.</span>
 345       The <a href="http://www.yahoo.com/">Yahoo</a>
 346       search for "formal system lambda delta" gives
 347       4 resources about λδ in the first 5 results.
 348    </li>
 349     </ul>
 350
 351    <div class="spacer">
 352       <img class="rule" alt="[Spacer]" title="lambdadelta rainbow rule" src="http://lambdadelta.info/images/rainbow.png" />
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 377     <div xmlns:ld="http://lambdadelta.info/" class="spacer">Last update: Wed, 22 Oct 2014 20:00:28 +0200</div>
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