walking isomorphism
- notation:
- objects: two objects and
- morphisms: identities, and two morphisms and that are mutually inverse
- nLab Link
- Related categories: ,
The name of this category comes from the fact that it consists of two objects and an isomorphism between them, and a functor out of this category is the same as an isomorphism in the target category. The walking isomorphism is actually equivalent to the trivial category.
Properties
Properties from the database
Deduced properties
- is essentially finite
- is small
- is essentially small
- is locally small
- is locally essentially small
- is well-copowered
- is well-powered
- is essentially discrete
- is a groupoid
- is thin
- has connected limits
- is finitary algebraic
- is a Grothendieck topos
- is self-dual
- is split abelian
- has equalizers
- is left cancellative
- has wide pullbacks
- has filtered limits
- has pullbacks
- is Cauchy complete
- has sequential limits
- is locally finitely presentable
- is locally presentable
- is cocomplete
- is complete
- is finitely complete
- has products
- has finite products
- has countable products
- has binary products
- has a terminal object
- is connected
- has a generator
- has exact filtered colimits
- has filtered colimits
- is locally ℵ₁-presentable
- has coproducts
- is an elementary topos
- is cartesian closed
- is infinitary distributive
- is distributive
- has finite coproducts
- has a strict initial object
- has an initial object
- has a subobject classifier
- has disjoint finite coproducts
- has disjoint coproducts
- is epi-regular
- is finitely cocomplete
- has a cogenerator
- is mono-regular
- is abelian
- is additive
- is preadditive
- has zero morphisms
- is pointed
- has coequalizers
- is Grothendieck abelian
- is Malcev
- is inhabited
- is balanced
- has connected colimits
- is right cancellative
- has wide pushouts
- has countable coproducts
- has binary coproducts
- has pushouts
- has a strict terminal object
- has sequential colimits
Non-Properties
Non-Properties from the database
- is not skeletal
Deduced Non-Properties*
- is not discrete
*This also uses the deduced properties.
Unknown properties
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Special morphisms
- Isomorphisms: every morphism
- Monomorphisms: every morphism
- Epimorphisms: every morphism