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<p><b><i>trees</i></b>, or <b><i>AST</i></b>s, is the smallest -indexed family of disjoint sets closed under the following conditions:</p>

<p>
# <b>Variables are ASTs:</b> if , then .<br/>
# <b>Operators combine ASTs:</b> If  is an operator of arity , and  for all , then .</p>

<p><big> See also </big></p>
<p><big> References </big></p>
<p><big> Further reading </big></p>
<p>
*  (overview of AST implementation in various language families)<br/>
* <br/>
* <br/>
* <br/>
* <a href="page.php?w=Robert_Harper_%28computer_scientist%29">Robert Harper</a> (2016).  (Second Edition).</p><p>
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