Implication Details
Claim: If a category has an extremal cogenerator, then it has a cogenerator and has an extremal cogenerating set.
Proof: This follows from the dual implication.
Show 79 categories using this implication
- empty category
- category of abelian groups
- category of finitely generated abelian groups
- category of algebras
- category of finite sets and bijections
- delooping of a group
- delooping of an infinite countable group
- delooping of a non-trivial finite group
- delooping of an infinite uncountable group
- delooping of the additive monoid of natural numbers
- delooping of the additive monoid of ordinal numbers
- category of Banach spaces with linear contractions
- category of commutative algebras
- category of commutative monoids
- category of commutative rings
- category of small categories
- category of cochain complexes of abelian groups
- simplex category
- category of coproducts of Euclidean spaces
- category of finite sets and injections
- category of finite sets and surjections
- category of finite abelian groups
- category of finite groups
- category of finite ordered sets
- category of finite sets
- category of finite sets of even cardinality
- category of finite sets of odd cardinality
- category of finite sets of cardinality a power of 3
- category of finite-dimensional vector spaces
- category of finite-dimensional vector spaces [countable field]
- category of finite-dimensional vector spaces [finite field]
- category of finite-dimensional vector spaces [uncountable field]
- category of fields
- category of fields of characteristic zero
- category of finitely generated free abelian groups
- category of finitely generated free modules over Z x Z
- category of groups
- category of countable groups
- category of Hausdorff spaces
- category of smooth manifolds
- category of measurable spaces
- category of metric spaces with non-expansive maps
- category of metric spaces with continuous maps
- category of metric spaces with ∞ allowed
- category of monoids
- category of sets with a distinguished subset
- partially ordered collection of ordinal numbers
- category of pseudo-metric spaces with non-expansive maps
- category of partially ordered sets
- category of partially ordered sets without isolated points
- category of preordered sets
- category of finitely generated projective modules over the ring of dual numbers
- category of left modules over a ring
- category of left modules over a division ring
- category of left modules over a non-semisimple ring
- category of sets and relations
- category of rings
- category of rngs
- category of semigroups
- category of sequences of abelian groups
- category of sets
- category of countable sets
- category of sets with finite-to-one maps
- category of non-empty sets
- category of topological spaces
- category of pointed topological spaces
- category of torsion abelian groups
- category of long transfinite sequences of abelian groups
- category of uniform spaces
- category of vector spaces
- cocompletion of a discrete–pair join
- category of graded abelian groups
- category of graded modules over a graded ring
- walking coreflexive pair
- walking idempotent
- walking morphism
- walking parallel pair
- walking span
- walking splitting