Nuprl - Proof: inv image ind a 1 1 1 1 2

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At: inv image ind a 1 1 1 1 2

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. y : S
9.

y':S. r(f(y'),f(y))

P(y')

P(y)

By:	BackThru 7

Generated subgoals:

None

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