walking fork

Notation Fork\Fork Objects three objects 0,1,20,1,2 Morphisms one morphism i:0→1i : 0 \to 1, two morphisms f,g:1⇉2f,g : 1 \rightrightarrows 2, one morphism 0→20 \to 2 (namely, f∘i=g∘if \circ i = g \circ i), and the identities Related Square\Square, Comp\Comp, Pair\Pair, ForkSquare\ForkSquare

This category can be pictured as: {0→1⇉2}\{0 \to 1 \rightrightarrows 2\} Its name comes from the fact that a functor Fork→C\Fork \to \C is the same as a fork in C\C. It can also be realized as the category of ordered sets of cardinality ≤2\leq 2 with injective order-preserving maps.

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

Special morphisms

  • isomorphisms: only the identities
  • monomorphisms: every morphism
  • epimorphisms: the identities and f,gf,g
  • regular monomorphisms: the identities and ii
  • regular epimorphisms: same as isomorphisms

Morphisms

The database stores 1 morphism based on the walking fork.