mathlib documentation

topology.category.Top.adjunctions

Adjunctions regarding the category of topological spaces #

This file shows that the forgetful functor from topological spaces to types has a left and right adjoint, given by Top.discrete, resp. Top.trivial, the functors which equip a type with the discrete, resp. trivial, topology.

Equipping a type with the discrete topology is left adjoint to the forgetful functor Top ⥤ Type.

Equations

Equipping a type with the trivial topology is right adjoint to the forgetful functor Top ⥤ Type.

Equations