CatDat

trivial category

  • notation: 1\1
  • objects: a single object 00
  • morphisms: only the identity morphism
  • Related categories: 2\20\0
  • nLab Link

This is the simplest category, consisting of a single object 00 and its identity morphism id0:00\id_0 : 0 \to 0. A concrete representation is the full subcategory of Set\Set consisting of the empty set. It is the terminal object in the category of small categories.

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: the unique object
  • initial object: the unique object
  • products: 0×00 \times 0
  • coproducts: 00=00 \sqcup 0 = 0

Special morphisms

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