walking span

Notation Span\Span Objects 0,1,20,1,2 Morphisms 0→10 \to 1, 0→20 \to 2, and the identities Related II, Pair\Pair External nLab Link

This category can be pictured as: {1←0→2}\{1 \leftarrow 0 \rightarrow 2\} Its name comes from the fact that a functor Span→C\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

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

Functors

The database stores 1 functor based on the walking span.