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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>
  41             </td>
  42             <td class="snns component green">
  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>
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  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>
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  75               <a href="http://lambdadelta.info/apps_2.html">Applications</a>
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  88             <td class="snss green">
  89               <a href="http://lambdadelta.info/version_1.html">Version 1</a>
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 102       </table>
 103     </div>
 104
 105    <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" />
 106     </div>
 107    <div xmlns:ld="http://lambdadelta.info/" class="text">
 108       The formal system λδ (\lambda\delta) is a typed λ-calculus aiming to support
 109       the foundations of Mathematics that require an underlying specification language
 110       (for example the <a href="http://www.math.unipd.it/~maietti/">Minimal Type Theory</a>
 111        and its predecessors).
 112    </div>
 113    <div xmlns:ld="http://lambdadelta.info/" class="text">
 114       λδ is developed in the context of the
 115       <a href="http://helm.cs.unibo.it/">Hypertextual Electronic Library of Mathematics</a>
 116       as a machine-checked digital specification
 117       that is not the formal counterpart of some previously published informal material.
 118    </div>
 119    <div xmlns:ld="http://lambdadelta.info/" class="text">
 120       λδ comes in several versions listed in the following table,
 121       which includes the major milestones:
 122    </div>
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 124       <table cellpadding="4" cellspacing="0">
 125         <tbody>
 126           <tr>
 127             <td class="snns component gray">version</td>
 128             <td class="snnn component gray">name</td>
 129             <td class="snnn component gray">developed with</td>
 130             <td class="snnn component gray">started</td>
 131             <td class="snnn component gray">announced</td>
 132             <td class="snnn component gray">released</td>
 133             <td class="ssnn component gray">dismissed</td>
 134           </tr>
 135           <tr>
 136             <td class="snns orange">2</td>
 137             <td class="snnn orange">
 138               <a href="http://lambdadelta.info/version_2.html">basic_2</a>
 139             </td>
 140             <td class="snnn orange">
 141               <a href="http://matita.cs.unibo.it/">Matita 0.99.2</a>
 142             </td>
 143             <td class="snnn orange">April 2011</td>
 144             <td class="snnn orange">July 2014</td>
 145             <td class="snnn orange">Planned in 2014</td>
 146             <td class="ssnn orange">Not planned yet</td>
 147           </tr>
 148           <tr>
 149             <td class="snss red">1</td>
 150             <td class="snsn red">
 151               <a href="http://lambdadelta.info/version_1.html">basic_1</a>
 152             </td>
 153             <td class="snsn red">
 154               <a href="http://coq.inria.fr/">Coq 7.3.1</a>
 155             </td>
 156             <td class="snsn red">May 2004</td>
 157             <td class="snsn red">January 2006</td>
 158             <td class="snsn red">November 2006</td>
 159             <td class="sssn red">May 2008</td>
 160           </tr>
 161         </tbody>
 162       </table>
 163     </div>
 164    <div xmlns:ld="http://lambdadelta.info/" class="text">
 165       This is the System logo: <a href="http://lambdadelta.info/images/crux_177.png">crux_177.png</a>
 166       (revised <span class="date">2012-09</span>).
 167    </div>
 168
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