Nuprl - Proof: decidable quotient equal 1 1 1 2 1

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At: decidable quotient equal 1 1 1 2 1

1. T : Type
2. E : T

Prop
3. EquivRel x,y:T. E(x,y)
4. f : T

x,y:T. (x f y)

E(x,y)
6. f

(x,y:T//E(x,y))

u,v:x,y:T//E(x,y). (u f v)

u = v

By:	RepD THEN CSquash

Generated subgoal:

1 7. u : x,y:T//E(x,y)
8. v : x,y:T//E(x,y)
((u f v) u = v)
6 steps

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