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
- is core-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 strongly connected
- has an extremal generator
- is core-thin
- is skeletal
- has an extremal cogenerator
- is cofiltered
- has directed limits
- has ℵ₁-cofiltered limits
- is regular-quotient-trivial
- has quotients of congruences
- is semi-strongly connected
- has sequential limits
- has an extremal generating set
- has a generator
- has wide pullbacks
- has coquotients of cocongruences
- is cosifted
- has a cogenerator
- has an extremal cogenerating set
- is connected
- has a generating set
- is inhabited
- has connected limits
- has a cogenerating set
- has cosifted limits
Unsatisfied Properties
Assigned properties
- 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 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 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 wide pushouts
- is not self-dual
- is not locally presentable
- is not ℵ₁-accessible
- is not locally multi-presentable
- is not locally poly-presentable
- is not additive
- does not have zero morphisms
- does not have binary copowers
- is not extensive
- is not trivial
- is not discrete
- 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 regular-subobject-trivial
- is not subobject-trivial
- does not have binary powers
- is not an elementary topos
- is not locally copresentable
- is not coextensive
- is not conormal
- does not have connected colimits
- does not have a quotient object classifier
- does not have coequalizers
- is not locally ℵ₁-presentable
- is not Grothendieck abelian
- is not finitely accessible
- is not abelian
- does not have biproducts
- is not a generalized variety
- does not have an initial object
- 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 countably extensive
- does not have disjoint finite coproducts
- is not filtered
- does not have binary coproducts
- does not have sifted colimits
- is not pointed
- does not have binary products
- does not have finite powers
- is not countable
- is not a pretopos
- is not cocomplete
- is not finitely cocomplete
- does not have a terminal object
- does not have cokernels
- does not satisfy CSP
- is not countably coextensive
- does not have finite copowers
- does not have disjoint finite products
- is not unital
- is not locally finitely presentable
- is not locally strongly finitely presentable
- is not locally finitely multi-presentable
- is not split abelian
- is not multi-algebraic
- does not have a multi-terminal object
- does not have disjoint coproducts
- does not have finite products
- is not infinitary extensive
- is not ℵ₁-filtered
- does not have a strict initial object
- does not have countable powers
- is not a quasitopos
- is not co-Malcev
- is not counital
- does not have a multi-initial object
- is not coregular
- does not have disjoint products
- does not have finite coproducts
- is not infinitary coextensive
- does not have a strict terminal object
- does not have countable copowers
- does not have a regular quotient object classifier
- does not have a natural numbers object
- is not finitary algebraic
- is not cartesian closed
- is not finitely complete
- is not multi-complete
- is not infinitary distributive
- is not countably distributive
- is not distributive
- does not have countable products
- does not have ℵ₂-small powers
- is not cocartesian coclosed
- is not multi-cocomplete
- is not Barr-coexact
- is not infinitary codistributive
- is not countably codistributive
- is not codistributive
- does not have cocartesian cofiltered limits
- does not have countable coproducts
- does not have ℵ₂-small copowers
- is not Malcev
- is not complete
- is not regular
- does not have ℵ₂-small products
- does not have powers
- does not have a regular subobject classifier
- does not have ℵ₂-small coproducts
- does not have copowers
- does not have products
- is not Barr-exact
- does not have coproducts
*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 morphism
- epimorphisms: finite ordinal numbers
- regular monomorphisms: ordinals of the form , where is any ordinal
- regular epimorphisms: same as isomorphisms