children' — Mathlib

English

The function children' returns the immediate subtrees from a nontrivial CofixA: for x = CofixA.intro _ f, children' x maps to f.

Русский

Функция children' возвращает непосредственные поддеревья из CofixA: для x = CofixA.intro _ f, children' x = f.

LaTeX

$$$\text{children}'\ x\ (head' x) \to \text{CofixA} F n$$$

Lean4

/-- for a non-trivial approximation, return all the subtrees of the root -/
def children' : ∀ {n} (x : CofixA F (succ n)), F.B (head' x) → CofixA F n
  | _, CofixA.intro _ f => f

Похожие утверждения