delooping of the additive monoid of ordinal numbers
- notation:
- objects: a single object
- morphisms: ordinal numbers, with addition as composition
- Related categories:
Every monoid induces a category with a single object . This also works when is large, in which case is not locally small. In this example, we apply this construction to the large monoid of ordinal numbers with respect to addition, so composition is .
Satisfied Properties
Assigned properties
- has a generator
- has a cogenerator
- is strongly connected
- is gaunt
- is left cancellative
- is well-copowered
- has equalizers
- has cofiltered limits
- is locally cartesian closed
- is ℵ₁-cofiltered
- has ℵ₁-filtered colimits
Deduced properties
- is Cauchy complete
- has coreflexive equalizers
- has effective cocongruences
- has effective congruences
- has reflexive coequalizers
- has pullbacks
- is semi-strongly connected
- has a generating set
- is inhabited
- is core-thin
- is skeletal
- is cofiltered
- has directed limits
- has ℵ₁-cofiltered limits
- has a cogenerating set
- has quotients of congruences
- is connected
- has sequential limits
- has wide pullbacks
- has coquotients of cocongruences
- is cosifted
- has connected limits
- has cosifted limits
Unsatisfied Properties
Assigned properties
- does not have an initial object
- is not one-way
- is not locally essentially small
- is not balanced
- is not well-powered
- does not have sequential colimits
- does not have pushouts
- does not have cofiltered-limit-stable epimorphisms
Deduced properties*
- is not accessible
- is not preadditive
- is not essentially discrete
- is not a groupoid
- is not pointed
- does not have a strict initial object
- is not mono-regular
- is not essentially small
- is not locally small
- is not locally finite
- is not thin
- is not direct
- is not a Grothendieck topos
- is not coaccessible
- is not locally cocartesian coclosed
- does not have a multi-initial object
- does not have exact cofiltered limits
- is not right cancellative
- is not quotient-trivial
- does not have directed colimits
- is not inverse
- is not essentially finite
- is not epi-regular
- does not have finite coproducts
- does not have finite copowers
- does not have wide pushouts
- is not self-dual
- is not unital
- is not locally presentable
- is not ℵ₁-accessible
- is not locally multi-presentable
- is not locally poly-presentable
- is not additive
- does not have biproducts
- does not have zero morphisms
- does not have binary copowers
- is not extensive
- is not trivial
- is not discrete
- does not have disjoint finite coproducts
- is not distributive
- is not sifted
- does not have filtered colimits
- is not normal
- is not small
- is not finite
- is not essentially countable
- does not have a subobject classifier
- is not subobject-trivial
- does not have binary powers
- is not an elementary topos
- is not counital
- is not locally copresentable
- does not have coequalizers
- is not cocartesian coclosed
- is not finitely cocomplete
- is not multi-cocomplete
- is not coextensive
- is not infinitary codistributive
- is not countably codistributive
- is not codistributive
- does not have cocartesian cofiltered limits
- is not conormal
- does not have countable coproducts
- does not have countable copowers
- does not have connected colimits
- does not have a quotient object classifier
- is not locally ℵ₁-presentable
- is not Grothendieck abelian
- is not finitely accessible
- is not locally finitely multi-presentable
- is not abelian
- is not a generalized variety
- is not multi-algebraic
- does not have disjoint coproducts
- is not countably distributive
- does not have kernels
- does not have exact filtered colimits
- does not have cartesian filtered colimits
- does not have filtered-colimit-stable monomorphisms
- does not satisfy CIP
- is not infinitary extensive
- is not filtered
- does not have binary coproducts
- does not have sifted colimits
- does not have binary products
- does not have finite powers
- is not countable
- is not a pretopos
- is not co-Malcev
- is not cocomplete
- is not coregular
- does not have cokernels
- does not satisfy CSP
- is not infinitary coextensive
- does not have ℵ₂-small coproducts
- does not have ℵ₂-small copowers
- does not have a regular quotient object classifier
- is not locally finitely presentable
- is not locally strongly finitely presentable
- is not split abelian
- is not infinitary distributive
- is not ℵ₁-filtered
- does not have a terminal object
- does not have finite products
- does not have countable powers
- is not Barr-coexact
- does not have coproducts
- does not have copowers
- does not have a natural numbers object
- is not finitary algebraic
- is not cartesian closed
- is not finitely complete
- does not have a multi-terminal object
- does not have countable products
- does not have ℵ₂-small powers
- does not have disjoint finite products
- does not have a strict terminal object
- is not Malcev
- is not complete
- is not multi-complete
- is not regular
- does not have ℵ₂-small products
- does not have powers
- does not have a regular subobject classifier
- does not have disjoint products
- does not have products
- is not Barr-exact
*This also uses the deduced satisfied properties.
Unknown properties
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Special objects
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Special morphisms
- isomorphisms: only the ordinal
- monomorphisms: every ordinal number
- epimorphisms: finite ordinal numbers
- regular monomorphisms: ordinals of the form , where is any ordinal
- regular epimorphisms: same as isomorphisms