Nuprl - Proof: set inc wrt imp sq 1 1 2 1

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At: set inc wrt imp sq 1 1 2 1

1. A : Type
2. B : A

Prop
3. B' : A

Prop
4.

x:A.

B(x)

B'(x)
5. x : {x:A| B(x) }
6. x

{x:A|

B'(x) }
7.

B(x)

{x:A| B'(x) }

By:	BackThru: Thm* x:A. B(x) x {x:A\| B(x) }

Generated subgoal:

1 B'(x)
1 step

About:

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