Nuprl - Proof: set functionality wrt one one corr n pred2 1

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At: set functionality wrt one one corr n pred2 1

1. A : Type
2. B : A

Prop
3. B' : A

Prop
4.

x:A. B(x)

B'(x)

{x:A| B(x) } ~ {x:A| B'(x) }

By:	Use:[f:= Id] BackThru: Thm* Bij(A; A'; f) Thm* Thm* (x:A. B(x) B'(f(x))) ({x:A\| B(x) } ~ {x:A'\| B'(x) })

Generated subgoals:

1 Bij(A; A; Id)
1 step

2 x:A. B(x) B'(Id(x))
1 step

About:

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