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

<PRE>
RingWithUnit: <b>trait</b>
  <b>includes</b> <A HREF="Ring.html">Ring</A>, <A HREF="Monoid.html">Monoid</A> (* <b>for</b> \circ, 1 <b>for</b> unit)
</PRE>

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