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At: quotient of nsubn 1 1 1

1. E: 11Prop
2. EquivRel x,y:1. x E y
3. x,y:1. Dec(x E y)

1 ~ (i,j:1//(i E j))

By: Unfold `one_one_corr` 0

Generated subgoal:

1 f:(1(i,j:1//(i E j))), g:((i,j:1//(i E j))1). InvFuns(1; i,j:1//(i E j); f; g)


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natural_numberquotientfunctionpropallexists