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At: select mem


T:Type, L:T*, i:||L||. mem_f(T;L[i];L)

By:
Analyze 0
THEN
Analyze 0
THEN
ListInd 2
THEN
Reduce 0


Generated subgoal:

11. T: Type
2. L: T*
3. u: T
4. v: T*
5. i:||v||. mem_f(T;v[i];v)
6. i: (||v||+1)
u = (u.v)[i] mem_f(T;(u.v)[i];v)


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