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  22     <div class="head1">The Formal System λδ (\lambda\delta)</div>
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  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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  53       The formal system λδ (\lambda\delta) is a typed λ-calculus aiming to support
  54       the foundations of Mathematics that require an underlying specification language
  55       (for example the <a href="http://www.math.unipd.it/~maietti/">Minimal Type Theory</a>
  56        and its predecessors).
  57    </div>
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  59       λδ is developed in the context of the
  60       <a href="http://helm.cs.unibo.it/">Hypertextual Electronic Library of Mathematics</a>
  61       as a machine-checked digital specification
  62       that is not the formal counterpart of some previously published informal material.
  63    </div>
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  65       λδ comes in several versions listed in the following table,
  66       which includes the major milestones:
  67    </div>
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  69       <table cellpadding="4" cellspacing="0">
  70         <tbody>
  71           <tr>
  72             <td class="snns component gray">version</td>
  73             <td class="snnn component gray">name</td>
  74             <td class="snnn component gray">developed with</td>
  75             <td class="snnn component gray">started</td>
  76             <td class="snnn component gray">announced</td>
  77             <td class="snnn component gray">released</td>
  78             <td class="ssnn component gray">dismissed</td>
  79           </tr>
  80           <tr>
  81             <td class="snns orange">2</td>
  82             <td class="snnn orange">basic_2</td>
  83             <td class="snnn orange">
  84               <a href="http://matita.cs.unibo.it/">Matita 0.99.2</a>
  85             </td>
  86             <td class="snnn orange">April 2011</td>
  87             <td class="snnn orange">July 2014</td>
  88             <td class="snnn orange">Planned in 2014</td>
  89             <td class="ssnn orange">Not planned yet</td>
  90           </tr>
  91           <tr>
  92             <td class="snss red">1</td>
  93             <td class="snsn red">basic_1</td>
  94             <td class="snsn red">
  95               <a href="http://coq.inria.fr/">Coq 7.3.1</a>
  96             </td>
  97             <td class="snsn red">May 2004</td>
  98             <td class="snsn red">January 2006</td>
  99             <td class="snsn red">November 2006</td>
 100             <td class="sssn red">May 2008</td>
 101           </tr>
 102         </tbody>
 103       </table>
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