Nuprl - Proof: unique fun description 1 1

IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At: unique fun description 1 1

1. A : Type
2. B : A

Type
3. P : x:A

B(x)

Prop
4.

x:A.

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

B(x)
6.

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

B(x)
8.

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

g = f

By:	FunExtensionality

Generated subgoal:

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

About:

IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html