Nuprl - Proof: l all map 2

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At: l all map 2

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

B
4. L : A List
5. P : B

Prop
6.

x:A. (x

P(f(x))
7. x : B
8. y : A
9. (y

L)
10. x = f(y)

P(x)

By:	HypSubst -1 0 THEN BackThruSomeHyp

Generated subgoals:

None

About:

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