delooping of the additive monoid of ordinal numbers
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 kernel pairs
- has pullbacks
- is strongly connected
- has an extremal generator
- has coreflexive equalizers
- is core-thin
- is skeletal
- has an extremal cogenerator
- is cofiltered
- has directed limits
- has ℵ₁-cofiltered limits
- is regular-quotient-trivial
- has effective congruences
- has quotients of congruences
- is semi-strongly connected
- has sequential limits
- has an extremal generating collection
- has a generator
- has wide pullbacks
- has pullback-stable regular epimorphisms
- has coquotients of cocongruences
- has effective cocongruences
- is cosifted
- has a cogenerator
- has an extremal cogenerating collection
- is retract-trivial
- has coequalizers of kernel pairs
- is connected
- has a generating collection
- is inhabited
- has connected limits
- has reflexive coequalizers
- has a cogenerating collection
- has cosifted limits
Unsatisfied properties
Assigned properties
- is not balanced
- is not well-powered
- does not have sequential colimits
- does not have cofiltered-limit-stable epimorphisms
Deduced properties*
- is not accessible
- is not mono-regular
- is not essentially small
- is not subobject-trivial
- is not an elementary topos
- is not finitely coaccessible
- is not coaccessible
- is not dually one-sorted finitary algebraic
- is not a dual generalized variety
- does not have exact cofiltered limits
- is not right cancellative
- is not quotient-trivial
- does not have directed colimits
- is not epi-regular
- is not self-dual
- is not locally presentable
- is not ℵ₁-accessible
- is not locally multi-presentable
- is not locally poly-presentable
- is not extensive
- is not locally essentially small
- is not trivial
- does not have filtered colimits
- is not locally finite
- is not a groupoid
- is not normal
- is not small
- is not essentially countable
- does not have a subobject classifier
- is not locally finitely copresentable
- is not locally copresentable
- is not essentially finite
- is not ℵ₁-coaccessible
- is not dually finitary algebraic
- is not locally multi-copresentable
- is not locally finitely multi-copresentable
- is not locally poly-copresentable
- is not co-Grothendieck abelian
- is not dually multi-algebraic
- does not have cokernel pairs
- is not coextensive
- is not conormal
- does not have a quotient object classifier
- is not thin
- is not a Grothendieck cotopos
- is not locally ℵ₁-presentable
- is not finitely accessible
- is not abelian
- is not a generalized variety
- is not additive
- does not have an initial object
- is not one-way
- does not have binary products
- is not essentially discrete
- does not have exact filtered colimits
- does not have cartesian filtered colimits
- does not have filtered-colimit-stable monomorphisms
- is not countably extensive
- does not have disjoint finite coproducts
- is not sifted
- does not have sifted colimits
- is not finite
- is not countable
- is not locally small
- is not concretizable
- is not regular-subobject-trivial
- does not have binary copowers
- does not have binary powers
- does not have zero morphisms
- is not a Grothendieck topos
- is not a pretopos
- is not total
- is not locally ℵ₁-copresentable
- does not have a terminal object
- does not have binary coproducts
- is not countably coextensive
- does not have wide pushouts
- does not have pushouts
- does not have equalizers of cokernel pairs
- does not have coequalizers
- does not have disjoint finite products
- is not an elementary cotopos
- is not a precotopos
- is not cototal
- does not have a natural numbers object
- is not locally finitely presentable
- is not finitary algebraic
- is not locally finitely multi-presentable
- is not preadditive
- is not Grothendieck abelian
- is not split abelian
- does not have biproducts
- is not multi-algebraic
- does not have a multi-terminal object
- is not discrete
- does not have disjoint coproducts
- does not have finite products
- does not have kernels
- does not satisfy CIP
- is not infinitary extensive
- is not filtered
- does not have connected colimits
- is not pointed
- does not have a strict initial object
- does not have finite powers
- is not direct
- does not have a conatural numbers object
- is not locally cocartesian coclosed
- is not finitely cocomplete
- does not have a multi-initial object
- does not have disjoint products
- does not have finite coproducts
- does not have cokernels
- does not satisfy CSP
- is not infinitary coextensive
- is not inverse
- does not have a strict terminal object
- does not have finite copowers
- is not coregular
- does not have pushout-stable regular monomorphisms
- is not unital
- does not have a parametrized natural numbers object
- is not one-sorted 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
- is not ℵ₁-filtered
- does not have countable products
- does not have countable powers
- is not a quasitopos
- is not co-Malcev
- is not counital
- does not have a coparametrized conatural numbers object
- is not cocartesian coclosed
- is not cocomplete
- is not multi-cocomplete
- 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 countable copowers
- is not Barr-coexact
- does not have a regular quotient object classifier
- is not a quasicotopos
- is not Malcev
- is not complete
- does not have ℵ₂-small products
- does not have ℵ₂-small powers
- is not regular
- does not have a regular subobject classifier
- does not have ℵ₂-small coproducts
- does not have ℵ₂-small copowers
- does not have products
- does not have powers
- is not Barr-exact
- does not have coproducts
- does not have copowers
*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