Nuprl - Proof: wellfounded functionality wrt implies 1 2 1

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At: wellfounded functionality wrt implies 1 2 1

1. T1 : Type
2. T2 : Type
3. r1 : T1

Prop
4. r2 : T2

Prop
5. T1 = T2
6.

x,y:T1. r1(x,y)

r2(x,y)
7. P : T2

Prop
8.

j:T2. (

k:T2. r2(k,j)

P(k))

P(j)
9. j : T1
10.

k:T1. r1(k,j)

P(k)

P(j)

By:	BackThru 8 THEN Thin 8

Generated subgoal:

1 8. j : T1
9. k:T1. r1(k,j) P(k)
10. k : T2
11. r2(k,j)
P(k)
2 steps

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