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True-listp-of-car-of-tree-nonleaf->branches

Definitions and Theorems

Theorem: true-listp-of-car-of-tree-nonleaf->branches

(defthm true-listp-of-car-of-tree-nonleaf->branches
  (true-listp (car (tree-nonleaf->branches x)))
  :rule-classes :type-prescription)