CatDat

walking idempotent

  • notation: Idem\Idem
  • objects: a single object 00
  • morphisms: two morphisms id0,e:00\id_0,e : 0 \to 0 with e2=ee^2=e
  • Related categories: BGBGIsom\IsomIISplit\Split

The name of this category comes from the fact that a functor IdemC\Idem \to \C is the same as an idempotent morphism in C\C. It can also be seen as the delooping of the monoid {1,e}\{1,e\} in which e2=ee^2=e.

Satisfied Properties

Assigned properties

Deduced properties

Unsatisfied Properties

Assigned properties

Deduced properties*

*This also uses the deduced satisfied properties.

Unknown properties

Special objects

Special morphisms

  • isomorphisms: the identity
  • monomorphisms: the identity
  • epimorphisms: the identity
  • regular monomorphisms: the identity
  • regular epimorphisms: the identity