core StandardLIB Doc
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Def x:AB(x) == x:AB(x)

is mentioned by

Thm* P,Q:(SProp).
Thm* S = T  (x:SP(x Q(x))  (x:SP(x))  (y:TQ(y))
[exists_functionality_wrt_implies]
Thm* P,Q:(SProp).
Thm* S = T  (x:SP(x Q(x))  ((x:SP(x))  (y:TQ(y)))
[exists_functionality_wrt_iff]
Thm* Q:(TProp). (x:TQ(x))  (x:TQ(x))[not_over_exists]
Thm* B:(TProp). (x:TA & B(x))  A & (x:TB(x))[exists_over_and_r]

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core StandardLIB Doc