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member-paren(x,y.E(x;y);i;s) == (
x
s.InjCase(x; a. E(a;i), E(a;i)))
is mentioned by
Thm*
E:(T
T
). (
x,y:T. E(x,y)
x = y)
(
i:T, s:(T+T) List. member-paren(x,y.E(x,y);i;s)
(inl(i)
s)
(inr(i)
s))
[assert-member-paren]
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