At: bool listify 1 1 1 2 1 2 2 2
1. T: Type
2. f: T
3. n: 
4. f1: nT
5. Bij(n; T; f1)
6. k: 
7. 0 < k
8. k
n
9. fL: T*
10. 
t:T. mem_f(T;t;fL) 
f(t)
11. i:(k-1). f(f1(i)) mem_f(T;f1(i);fL)
12. 
f(f1(k-1))
13. i: k
14. f(f1(i))
15. i = k-1
mem_f(T;f1(i);fL)
By: BackThru 11
Generated subgoals:None
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