mathlib documentation

category_theory.limits.lattice

The limit of a functor from a finite diagram into a semilattice_inf_top is the infimum of the objects in the image.

The colimit of a functor from a finite diagram into a semilattice_sup_bot is the supremum of the objects in the image.

theorem category_theory.limits.complete_lattice.finite_product_eq_finset_inf {α : Type u} [semilattice_inf_top α] {ι : Type u} [decidable_eq ι] [fintype ι] (f : ι → α) :
( f) = (fintype.elems ι).inf f

A finite product in the category of a semilattice_inf_top is the same as the infimum.

theorem category_theory.limits.complete_lattice.finite_coproduct_eq_finset_sup {α : Type u} [semilattice_sup_bot α] {ι : Type u} [decidable_eq ι] [fintype ι] (f : ι → α) :
( f) = (fintype.elems ι).sup f

A finite coproduct in the category of a semilattice_sup_bot is the same as the supremum.

@[simp]
theorem category_theory.limits.complete_lattice.prod_eq_inf {α : Type u} [semilattice_inf_top α] (x y : α) :
(x y) = x y

The binary product in the category of a semilattice_inf_top is the same as the infimum.

@[simp]
theorem category_theory.limits.complete_lattice.coprod_eq_sup {α : Type u} [semilattice_sup_bot α] (x y : α) :
(x ⨿ y) = x y

The binary coproduct in the category of a semilattice_sup_bot is the same as the supremum.

@[simp]
theorem category_theory.limits.complete_lattice.pullback_eq_inf {α : Type u} [semilattice_inf_top α] {x y z : α} (f : x z) (g : y z) :

The pullback in the category of a semilattice_inf_top is the same as the infimum over the objects.

@[simp]
theorem category_theory.limits.complete_lattice.pushout_eq_sup {α : Type u} [semilattice_sup_bot α] (x y z : α) (f : z x) (g : z y) :

The pushout in the category of a semilattice_sup_bot is the same as the supremum over the objects.

The limit cone over any functor into a complete lattice.

Equations

The limit of a functor into a complete lattice is the infimum of the objects in the image.

The colimit of a functor into a complete lattice is the supremum of the objects in the image.