CatDat

walking composable pair

  • notation: Comp\Comp
  • objects: three objects 0,1,20,1,2
  • morphisms: a single morphism from each natural number to one greater than or equal to it
  • Related categories: Fork\ForkII
  • nLab Link

This category can be pictured as: {012}\{ 0 \to 1 \to 2 \} Its name comes from the fact that a functor CompC\Comp \to \C is the same as a composable pair of morphisms in C\C.

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: 22
  • initial object: 00
  • products: infimum taken in {0<1<2}\{0 < 1 < 2\}
  • coproducts: supremum taken in {0<1<2}\{0 < 1 < 2\}

Special morphisms

  • isomorphisms: the three identities
  • monomorphisms: every morphism
  • epimorphisms: every morphism
  • regular monomorphisms: same as isomorphisms
  • regular epimorphisms: same as isomorphisms