Nuprl - Proof: unique fun description2

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At: unique fun description2

A:Type, B:(A

Type), P:(x:A

B(x)

Prop).

(

x:A.

!y:B(x). P(x,y))

(

{f:(x:A

B(x))|

x:A. P(x,f(x)) })

By:	SimilarTo Thm* B:(AType), P:(x:AB(x)Prop). Thm* (x:A. !y:B(x). P(x,y)) (!f:(x:AB(x)). x:A. P(x,f(x)))

Generated subgoal:

1 1. A : Type
2. B : AType
3. P : x:AB(x)Prop
4. x:A. !y:B(x). P(x,y)
5. !f:(x:AB(x)). x:A. P(x,f(x))
!{f:(x:AB(x))| x:A. P(x,f(x)) }
4 steps

About:

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