Nuprl - Proof: inv image ind tp 1 1 1 1 1 1 3

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At: inv image ind tp 1 1 1 1 1 1 3

1. T : Type
2. r : T

Prop
3. S : Type
4. f : S

T
5. WellFnd{i}(T;x,y.r(x,y))
6. P : S

Prop
7.

j:S. (

k:S. r(f(k),f(j))

P(k))

P(j)
8. j : T

(

k:T. r(k,j)

(

n:S. f(n) = k

P(n)))

Prop

By:	AddHiddenLabel `wf`

Generated subgoal:

1 (k:T. r(k,j) (n:S. f(n) = k P(n))) Prop
1 step

About:

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