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At: hd mem


T:Type, L:T*. ||L||1 mem_f(T;hd(L);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. ||v||1 mem_f(T;hd(v);v)
6. ||v||+11
u = u mem_f(T;u;v)


About:
alluniverselistimpliesnatural_numberorequal