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