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At: length of not nil 3

1. A : Type
2. A List
3. u : A
4. v : A List
5. ||v||+11
  u.v = nil


By: Auto


Generated subgoal:

1   u.v = nil
1 step

About:
listconsnilnatural_numberadduniverseequal
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(5steps total) PrintForm Definitions Lemmas list 1 Sections StandardLIB Doc