Nuprl - Proof: inv image ind tp 1 1

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At: inv image ind tp 1 1

1. T : Type
2. r : T

Prop
3. S : Type
4. f : S

T
5. WellFnd{i}(T;x,y.r(x,y))

P:(S

Prop). (

j:S. (

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

P(k))

P(j))

(

n:S. P(n))

By:	Unfold `guard` 0 THEN UnivCD

Generated subgoal:

1 6. P : SProp
7. j:S. (k:S. r(f(k),f(j)) P(k)) P(j)
8. n : S
P(n)
29 steps

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