CatDat

walking isomorphism

  • notation: Isom\Isom
  • objects: two objects 00 and 11
  • morphisms: identities, and two morphisms 010 \to 1 and 101 \to 0 that are mutually inverse
  • Related categories: 1\1Idem\IdemII
  • nLab Link

This category can be pictured as: {01}\{0 \rightleftarrows 1\} Its name comes from the fact that a functor IsomC\Isom \to \C is the same as an isomorphism in C\C. The walking isomorphism is actually equivalent to the trivial category.

Satisfied Properties

Assigned properties

Deduced properties

Unsatisfied Properties

Assigned properties

Deduced properties*

*This also uses the deduced satisfied properties.

Unknown properties

Special objects

  • terminal object: both objects
  • initial object: both objects
  • products: 0×0=00 \times 0 = 0
  • coproducts: 00=00 \sqcup 0 = 0

Special morphisms

  • isomorphisms: every morphism
  • monomorphisms: every morphism
  • epimorphisms: every morphism
  • regular monomorphisms: same as isomorphisms
  • regular epimorphisms: same as isomorphisms