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At: dec iff ex bvfun 1

1. T : Type
2. E : TTProp
3. x,y:T. Dec(E(x,y))
  f:(TT). x,y:Tf(x,y E(x,y)


By: (RenameVar `g' 3) THEN (Unfold `decidable` 3)
THEN
Witness x,y. InjCase(g(x,y); a. trueb. false)
THEN
(Reduce 0)


Generated subgoal:

1 3. g : x,y:TE(x,y E(x,y)
  x,y:T. InjCase(g(x,y); a. trueb. false E(x,y)

12 steps

About:
boolbfalsebtrueassertdecidabledecide
lambdaapplyfunctionuniversepropallexists
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