Mathlib Map

Structures · Category theory

CategoryTheory.CountableCategory

A category with countably many objects and morphisms.

Defined in
Mathlib.CategoryTheory.Countable
Shape
One type argument · adds countableObj, countableHom
Open in Mathlib docs

Extends0

Extends nothing: this is a root of the hierarchy.

Extended by1

Forgetful instances

Every CategoryTheory.CountableCategory is also a

Provided automatically by

Concrete types that are instances6

  • Nat
  • CategoryTheory.Discrete
  • CategoryTheory.ULiftHom
  • CategoryTheory.CountableCategory.ObjAsType
  • CategoryTheory.CountableCategory.HomAsType
  • Opposite

How is a type an instance?

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Assumed by24

Ancestors3