Theorems · Theorem · category theory

CategoryTheory.Comma.mapFst_hom_app

∀ {A : Type u₁} [inst : CategoryTheory.Category.{v₁, u₁} A] {B : Type u₂} [inst_1 : CategoryTheory.Category.{v₂, u₂} B]
  {T : Type u₃} [inst_2 : CategoryTheory.Category.{v₃, u₃} T] {A' : Type u₄}
  [inst_3 : CategoryTheory.Category.{v₄, u₄} A'] {B' : Type u₅} [inst_4 : CategoryTheory.Category.{v₅, u₅} B']
  {T' : Type u₆} [inst_5 : CategoryTheory.Category.{v₆, u₆} T'] {L : CategoryTheory.Functor A T}
  {R : CategoryTheory.Functor B T} {L' : CategoryTheory.Functor A' T'} {R' : CategoryTheory.Functor B' T'}
  {F₁ : CategoryTheory.Functor A A'} {F₂ : CategoryTheory.Functor B B'} {F : CategoryTheory.Functor T T'}
  (α : F₁.comp L' ⟶ L.comp F) (β : R.comp F ⟶ F₂.comp R') (X : CategoryTheory.Comma L R),
  (CategoryTheory.Comma.mapFst α β).hom.app X = CategoryTheory.CategoryStruct.id (F₁.obj X.left)

Defined in

Mathlib.CategoryTheory.Comma.Basic

Cited by

0 results in Mathlib

Foundations

Depth 25 from the axioms · uses propext, Classical.choice, Quot.sound

Assumes

CategoryTheory.CategoryCategoryTheory.CategoryCategoryTheory.CategoryCategoryTheory.CategoryCategoryTheory.CategoryCategoryTheory.Category