Nuprl - Proof: l all map 1

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At: l all map 1

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

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

Prop
6.

x:B. (

y:A. (y

L) & x = f(y))

P(x)
7. x : A
8. (x

P(f(x))

By:	BackThruSomeHyp THEN InstConcl [x]

Generated subgoals:

None

About:

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