Structure

category of finite sets of even cardinality

Notation FinSeteven⁡\FinSet_{\even} Objects finite sets of even cardinality Morphisms maps Related FinSet\FinSet, FinSet3∙\FinSet_{3^\bullet}, FinSetodd⁡\FinSet_{\odd}
This is the full subcategory of FinSet\FinSet consisting of finite sets with even cardinality, for example ∅\varnothing and {0,1}\{0,1\}, but not {1}\{1\}. We have included this category only because of its interesting property combinations.

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: empty set
  • products: [non-empty, finite case] direct products
  • coproducts: [finite case] disjoint unions

Special morphisms

  • isomorphisms: bijective maps
  • monomorphisms: injective maps
  • epimorphisms: surjective maps
  • regular monomorphisms: same as monomorphisms
  • regular epimorphisms: same as epimorphisms