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At: list length non negative


T:Type, L:T List. ||(L)0

By:
UnivCD
THEN
ListInd 2
THEN
AbReduce 0


Generated subgoals:

11. T: Type
2. L: T List
00
21. T: Type
2. L: T List
3. u: T
4. v: T List
5. ||(v)0
1+||(v)0

About:
listnatural_numberaddapplyuniverseall

(3steps) PrintForm Definitions list 3 jlc Sections Support(jlc) Doc