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

<PRE>
LeftIdentity: <b>trait</b>
  <b>introduces</b>
    __ \circ __: T, T -&gt; T
    unit: -&gt; T
  <b>asserts</b> <b>forall</b> x: T
    unit \circ x == x
</PRE>

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