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  22     <div class="head1">The Formal System λδ (\lambda\delta)</div>
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  33             <td class="snns capitalize italic sky">
  34               <a href="http://lambdadelta.info/index.html">home</a>
  35             </td>
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  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>
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  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>
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  84               <br />
  85             </td>
  86             <td class="ssss capitalize green">
  87               <a href="http://lambdadelta.info/implementation.html#helena">helena</a>
  88             </td>
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  92     </div>
  93
  94    <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" />
  95     </div>
  96    <div xmlns:ld="http://lambdadelta.info/" class="text">
  97       The formal system λδ (\lambda\delta) is a typed λ-calculus aiming to support
  98       the foundations of Mathematics that require an underlying specification language
  99       (for example the <a href="http://www.math.unipd.it/~maietti/">Minimal Type Theory</a>
 100        and its predecessors).
 101    </div>
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 103       λδ is developed in the context of the
 104       <a href="http://helm.cs.unibo.it/">Hypertextual Electronic Library of Mathematics</a>
 105       as a machine-checked digital specification
 106       that is not the formal counterpart of some previously published informal material.
 107    </div>
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 109       This is the System logo: <a href="http://lambdadelta.info/images/crux_177.png">crux_177.png</a>
 110       (revised <span class="date">2012-09</span>).
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