∫ Утверждение Mathlib
root_ne_bot_of_mem_subtrees
Mathlib.Order.SuccPred.Tree
URI: https://scilib.ai/kg/mathlib#SubRootedTree.root_ne_bot_of_mem_subtrees
∫ Утверждение Mathlib
Mathlib.Order.SuccPred.Tree
URI: https://scilib.ai/kg/mathlib#SubRootedTree.root_ne_bot_of_mem_subtrees