[<A HREF="PreOrder.ps">PostScript</A>]

<PRE>
PreOrder (&lt;=, T): <b>trait</b>
  <b>includes</b> <A HREF="Reflexive.html">Reflexive</A> (&lt;=), <A HREF="Transitive.html">Transitive</A> (&lt;=)
  <b>implies</b> <b>forall</b> x, y, z: T
    x &lt;= x;
    (x &lt;= y /\ y &lt;= z) =&gt; x &lt;= z
</PRE>

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