trivial category
- notation:
- objects: a single object
- morphisms: only the identity morphism
- nLab Link
- Related categories:
This is the simplest category, consisting of a single object and only the identity morphism. It is the terminal object in the category of small categories.
Properties
Properties from the database
Deduced properties
is small
Since it is finite, we deduce that it is small.is essentially finite
Since it is finite, we deduce that it is essentially finite.is essentially small
Since it is essentially finite, we deduce that it is essentially small.is essentially discrete
Since it is discrete, we deduce that it is essentially discrete.is locally small
Since it is discrete, we deduce that it is locally small.is skeletal
Since it is discrete, we deduce that it is skeletal.is thin
Since it is essentially discrete, we deduce that it is thin.is a groupoid
Since it is essentially discrete, we deduce that it is a groupoid.is locally essentially small
Since it is essentially discrete, we deduce that it is locally essentially small.has connected limits
Since it is essentially discrete, we deduce that it has connected limits.is finitary algebraic
Since it is trivial, we deduce that it is finitary algebraic.is a Grothendieck topos
Since it is trivial, we deduce that it is a Grothendieck topos.is split abelian
Since it is trivial, we deduce that it is split abelian.is self-dual
Since it is trivial, we deduce that it is self-dual.has equalizers
Since it is thin, we deduce that it has equalizers.is left cancellative
Since it is thin, we deduce that it is left cancellative.has wide pullbacks
Since it has connected limits, we deduce that it has wide pullbacks.has pullbacks
Since it has wide pullbacks, we deduce that it has pullbacks.has filtered limits
Since it has wide pullbacks, we deduce that it has filtered limits.is Cauchy complete
Since it has equalizers, we deduce that it is Cauchy complete.has sequential limits
Since it has filtered limits, we deduce that it has sequential limits.is locally finitely presentable
Since it is finitary algebraic, we deduce that it is locally finitely presentable.is an elementary topos
Since it is a Grothendieck topos, we deduce that it is an elementary topos.has coproducts
Since it is a Grothendieck topos, we deduce that it has coproducts.has a generator
Since it is a Grothendieck topos, we deduce that it has a generator.is locally presentable
Since it is a Grothendieck topos, we deduce that it is locally presentable.has a cogenerator
Since it is a Grothendieck topos, we deduce that it has a cogenerator.is abelian
Since it is split abelian, we deduce that it is abelian.is Malcev
Since it is abelian, we deduce that it is Malcev.is mono-regular
Since it is a groupoid, we deduce that it is mono-regular.is well-powered
Since it is a groupoid, we deduce that it is well-powered.is inhabited
Since it has a generator, we deduce that it is inhabited.is balanced
Since it is mono-regular, we deduce that it is balanced.is finitely complete
Since it is Malcev, we deduce that it is finitely complete.has connected colimits
Since it is essentially discrete, we deduce that it has connected colimits.has coequalizers
Since it is thin, we deduce that it has coequalizers.is right cancellative
Since it is thin, we deduce that it is right cancellative.is cocomplete
Since it has coproducts and has coequalizers, we deduce that it is cocomplete.has finite coproducts
Since it has coproducts, we deduce that it has finite coproducts.has countable coproducts
Since it has coproducts, we deduce that it has countable coproducts.has an initial object
Since it has finite coproducts, we deduce that it has an initial object.has binary coproducts
Since it has finite coproducts, we deduce that it has binary coproducts.has pushouts
Since it has binary coproducts and has coequalizers, we deduce that it has pushouts.is connected
Since it has an initial object, we deduce that it is connected.has wide pushouts
Since it has connected colimits, we deduce that it has wide pushouts.has filtered colimits
Since it has wide pushouts, we deduce that it has filtered colimits.has sequential colimits
Since it has coequalizers and has countable coproducts, we deduce that it has sequential colimits.is complete
Since it is essentially small and is thin and is cocomplete, we deduce that it is complete.is epi-regular
Since it is a groupoid, we deduce that it is epi-regular.is well-copowered
Since it is a groupoid, we deduce that it is well-copowered.is finitely cocomplete
Since it is self-dual and is finitely complete, we deduce that it is finitely cocomplete.has a terminal object
Since it is self-dual and has an initial object, we deduce that it has a terminal object.has products
Since it is self-dual and has coproducts, we deduce that it has products.has finite products
Since it is self-dual and has finite coproducts, we deduce that it has finite products.has binary products
Since it is self-dual and has binary coproducts, we deduce that it has binary products.has countable products
Since it is self-dual and has countable coproducts, we deduce that it has countable products.has a strict initial object
Since it is left cancellative and has an initial object, we deduce that it has a strict initial object.has exact filtered colimits
Since it is locally finitely presentable, we deduce that it has exact filtered colimits.is locally ℵ₁-presentable
Since it is locally finitely presentable, we deduce that it is locally ℵ₁-presentable.is cartesian closed
Since it is an elementary topos, we deduce that it is cartesian closed.has a subobject classifier
Since it is an elementary topos, we deduce that it has a subobject classifier.has disjoint finite coproducts
Since it is an elementary topos, we deduce that it has disjoint finite coproducts.is additive
Since it is abelian, we deduce that it is additive.is Grothendieck abelian
Since it is abelian and has coproducts and has a generator and has exact filtered colimits, we deduce that it is Grothendieck abelian.has a strict terminal object
Since it is right cancellative and has a terminal object, we deduce that it has a strict terminal object.is preadditive
Since it is additive, we deduce that it is preadditive.has disjoint coproducts
Since it has coproducts and has disjoint finite coproducts, we deduce that it has disjoint coproducts.is distributive
Since it is cartesian closed and has finite coproducts, we deduce that it is distributive.is infinitary distributive
Since it is cartesian closed and has coproducts, we deduce that it is infinitary distributive.has zero morphisms
Since it is preadditive, we deduce that it has zero morphisms.is pointed
Since it has zero morphisms and has a terminal object, we deduce that it is pointed.
Non-Properties
Non-Properties from the database
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Deduced Non-Properties*
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*This also uses the deduced properties.
Unknown properties
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Special morphisms
Isomorphisms: every morphism
trivial- Monomorphisms: every morphism
Epimorphisms: every morphism
it is discrete