empty category
- notation:
- objects: no objects
- morphisms: no morphisms
- nLab Link
This is the category with no objects and no morphisms. It is the initial object in the category of (small) categories.
Satisfied Properties
Properties from the database
- has binary products
- is discrete
- is finite
- is preadditive
Deduced properties
- has binary powers
- is essentially finite
- is small
- is essentially small
- is locally small
- is locally essentially small
- is well-copowered
- is well-powered
- has a generating set
- is direct
- is one-way
- is skeletal
- is thin
- has sequential limits
- has reflexive coequalizers
- has zero morphisms
- is essentially discrete
- is a groupoid
- has directed limits
- is left cancellative
- is Cauchy complete
- has filtered colimits
- has directed colimits
- has coreflexive equalizers
- has equalizers
- has pullbacks
- has sifted colimits
- has wide pullbacks
- has connected limits
- has cofiltered limits
- is mono-regular
- is self-dual
- is locally cartesian closed
- is balanced
- has cosifted limits
- has sequential colimits
- has a cogenerating set
- is epi-regular
- has pushouts
- has wide pushouts
- is right cancellative
- is inverse
- has connected colimits
- has coequalizers
- has binary copowers
- has binary coproducts
Unsatisfied Properties
Properties from the database
- is not inhabited
Deduced properties*
- does not have a generator
- does not have coproducts
- does not have disjoint coproducts
- is not infinitary distributive
- is not infinitary extensive
- is not finitary algebraic
- is not Grothendieck abelian
- is not trivial
- does not have disjoint finite coproducts
- does not have biproducts
- is not extensive
- is not lextensive
- does not have an initial object
- is not pointed
- does not have a strict initial object
- is not distributive
- is not additive
- does not have finite products
- does not have products
- does not have a terminal object
- does not have countable products
- is not complete
- is not finitely complete
- does not have finite powers
- does not have countable powers
- does not have powers
- does not have exact filtered colimits
- is not regular
- is not abelian
- is not split abelian
- does not have finite coproducts
- is not locally strongly finitely presentable
- is not connected
- is not locally presentable
- is not locally finitely presentable
- is not locally ℵ₁-presentable
- is not cartesian closed
- is not an elementary topos
- does not have a subobject classifier
- does not have a regular subobject classifier
- is not a Grothendieck topos
- is not strongly connected
- is not Malcev
- is not unital
- does not have countable coproducts
- is not cocomplete
- is not finitely cocomplete
- does not have finite copowers
- does not have countable copowers
- does not have copowers
- does not have disjoint products
- does not have disjoint finite products
- is not infinitary codistributive
- is not codistributive
- does not have a strict terminal object
- is not coextensive
- is not infinitary coextensive
- is not coregular
- does not have a cogenerator
- is not co-Malcev
- is not counital
*This also uses the deduced satisfied properties.
Unknown properties
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Special objects
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Special morphisms
- isomorphisms: none
- monomorphisms: none
- epimorphisms: none
- regular monomorphisms: same as monomorphisms
- regular epimorphisms: same as epimorphisms