preordered set of integers w.r.t. divisibility

Notation (Z,∣)(\IZ,\mid) Objects integers Morphisms a unique morphism (a,b):a→b(a,b) : a \to b if aa divides bb Related (N,≤)(\IN,\leq)

This category corresponds to a preordered set, not a partially ordered set, because aa and −a-a divide each other, but are not equal for a≠0a \neq 0. Notice that this category is equivalent (but not isomorphic) to (N,∣)(\IN,\mid).

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

  • terminal object: 00
  • initial object: 11
  • products: greatest common divisor
  • coproducts: the least common multiple, can be 00 for infinite families

Special morphisms

  • isomorphisms: the identities (a,a):a→a(a,a) : a \to a and the isomorphisms (a,−a):a→−a(a,-a) : a \to -a for a∈Za \in \IZ
  • monomorphisms: every morphism
  • epimorphisms: every morphism
  • regular monomorphisms: same as isomorphisms
  • regular epimorphisms: same as isomorphisms