[isabelle] ML "set simp_trace": Congruence Rule question
I am examining the simplifier's trace for the following lemma:
lemma "(if A=A then AV else if AA=BB then BV else CV) = AV"
There is a part of the trace I do not understand - specifically I am
talking about the following part:
Applying congruence rule:
A = A == ?c
==> if A = A then AV else if AA = BB then BV else CV ==
if ?c then AV else if AA = BB then BV else CV
Where did the A =A == ?c rule came from?
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