Nuprl - Proof: card settype 1

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At: card settype 1

1. A : Type
2. A' : Type
3. B : A

Prop
4. B' : A'

Prop
5. f : A

A'
6. Bij(A; A'; f)
7.

x:A. B(x)

B'(f(x))

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

By:	FwdThru: Thm* f:(AB). Bij(A; B; f) (g:(BA). InvFuns(A;B;f;g)) on [ Bij(A; A'; f) ] THEN Analyze-1

Generated subgoal:

1 8. g : A'A
9. InvFuns(A;A';f;g)
{x:A| B(x) } ~ {x:A'| B'(x) }
21 steps

About:

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