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

<PRE>
Commutative (\circ, T, Range): <b>trait</b>
  <b>introduces</b> __ \circ __: T, T -&gt; Range
  <b>asserts</b> <b>forall</b> x, y: T
    x \circ y == y \circ x
</PRE>

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