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

<PRE>
Involutive (op, T): <b>trait</b>
  <b>introduces</b> op: T -&gt; T
  <b>asserts</b> <b>forall</b> x: T
    op(op(x)) == x
</PRE>

[<A HREF="toc.html">Table of Contents</A>] [<A HREF="index.html">Index</A>]