CatDat

walking span

  • notation: Span\Span
  • objects: 0,1,20,1,2
  • morphisms: 010 \to 1, 020 \to 2, and the identities
  • Related categories: IIPair\Pair
  • nLab Link

This category can be pictured as: {102}\{1 \leftarrow 0 \rightarrow 2\} Its name comes from the fact that a functor SpanC\Span \to \C is the same as a span 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

  • initial object: 00
  • products: [binary case] 1×2=01 \times 2 = 0, x×x=xx \times x = x, 0×x=00 \times x = 0

Special morphisms

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