Nuprl - Proof: unique indep fun description 1 1

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At: unique indep fun description 1 1

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))
7. g : A

B
8.

x:A. P(x,g(x))

g = f

By:	FunExtensionality

Generated subgoal:

1 9. x : A
g(x) = f(x)
4 steps

About:

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