Nuprl - Proof: rel inverse exp 2 2 1

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At: rel inverse exp 2 2 1

1. T : Type
2. R : T

Prop
3. n :

4. 0<n
5.

x,y:T. (x R^n-1^-1 y)

(x R^-1^n-1 y)
6. x : T
7. y : T
8.

n = 0
9. z : T
10. x R^-1 z
11. z R^-1^n-1 y

y R^n x

By:	Unfold `rel_inverse` -2 THEN Reduce -2

Generated subgoal:

1 10. z R x
11. z R^-1^n-1 y
y R^n x
3 steps

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