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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">home</a>
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  37               <a href="http://lambdadelta.info/news.html">news</a>
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  40               <a href="http://lambdadelta.info/documentation.html">documentation</a>
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  42             <td class="snns capitalize italic green">
  43               <a href="http://lambdadelta.info/implementation.html">implementation</a>
  44             </td>
  45             <td class="ssnn capitalize italic green">(<a href="http://lambdadelta.info/implementation.html#specifications">specifications</a> - <a href="http://lambdadelta.info/implementation.html#lddl">library</a> - <a href="http://lambdadelta.info/implementation.html#helena">Helena</a>)</td>
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  52               <a href="http://lambdadelta.info/news.html#milestones">Milestones</a>
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  55               <a href="http://lambdadelta.info/documentation.html#v2">Version 2</a>
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  58               <a href="http://lambdadelta.info/version_2.html">Version 2</a>
  59             </td>
  60             <td class="ssnn 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>
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  70               <a href="http://lambdadelta.info/documentation.html#v1">Version 1</a>
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  73               <a href="http://lambdadelta.info/version_1.html">Version 1</a>
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  83    <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" />
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  86       The formal system λδ (\lambda\delta) is a typed λ-calculus aiming to support
  87       the foundations of Mathematics that require an underlying specification language
  88       (for example the <a href="http://www.math.unipd.it/~maietti/">Minimal Type Theory</a>
  89        and its predecessors).
  90    </div>
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  92       λδ is developed in the context of the
  93       <a href="http://helm.cs.unibo.it/">Hypertextual Electronic Library of Mathematics</a>
  94       as a machine-checked digital specification
  95       that is not the formal counterpart of some previously published informal material.
  96    </div>
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  98       This is the System logo: <a href="http://lambdadelta.info/images/crux_177.png">crux_177.png</a>
  99       (revised <span class="date">2012-09</span>).
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