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At: inv of fin is fin 1 1

1. T: Type
2. S: Type
3. f: TS
4. Fin(S)
5. s:S. Dec(t:T. f(t) = s)

Fin(x,y:T//(f(x) = f(y)))

By: Assert (EquivRel x,y:T. f(x) = f(y))

Generated subgoals:

1 EquivRel x,y:T. f(x) = f(y)
26. EquivRel x,y:T. f(x) = f(y)
Fin(x,y:T//(f(x) = f(y)))


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