At: inv of fin is fin 1 1 2 2 1 2 1 1 2 2 1 2 3
1. T: Type
2. S: Type
3. f: T
S
4. Fin(S)
5. 
s:S. Dec(
t:T. f(t) = s)
6. EquivRel x,y:T. f(x) = f(y)
7. f@0: {s:S| t:T. f(t) = s }T
8. s:{s:S| t:T. f(t) = s }. f(f@0(s)) = s
9. b: x,y:T//(f(x) = f(y))
(t:T. f(t) = f(b))
By: UseEqWitness *
Generated subgoal:| 1 | * = *  (t:T. f(t) = f(b)) |
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