Nuprl - Proof: partition type 1 1 2

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At: partition type 1 1 2

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

Prop
4.

x:A.

!y:B. P(x;y)
5. f : A

B
6.

x:A. P(x;f(x))

InvFuns(A;y:B

{x:A| P(x;y) };

x.<f(x),x>;

yx.2of(yx))

By:	Analyze THEN New:u Analyze THEN Reduce Concl

Generated subgoal:

1 7. u : y:B{x:A| P(x;y) }
<f(2of(u)),2of(u)> = u y:B{x:A| P(x;y) }
8 steps

About:

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