δlastFunctor — Mathlib

English

The map forgetting the last arrow in a sequence, δ_last, is defined as the image under δ_lastFunctor.

Русский

Картирование δ_last — образ δ_lastFunctor, забывающий последнюю стрелу.

LaTeX

$$$$ \\delta_{\\text{last}} = δ_{\\text{last}}^{\\text{Functor}} $$$$

Lean4

/-- The functor `ComposableArrows C (n + 1) ⥤ ComposableArrows C n` which forgets
the last arrow. -/
@[simps!]
def δlastFunctor : ComposableArrows C (n + 1) ⥤ ComposableArrows C n :=
  whiskerLeftFunctor (Fin.castSuccFunctor (n + 1))

Похожие утверждения