Implication details
Claim: If a category has countable powers and is essentially countable, then it is thin.
Proof: Adjust the proof of Mac Lane, V.2, Prop. 3.
This implication has a dual.
Show 55 categories using this implication
- category of abelian groups
- category of finitely generated abelian groups
- category of algebras
- delooping of an infinite countable group
- delooping of the additive monoid of natural numbers
- category of Banach spaces with linear contractions
- category of sets equipped with a binary relation
- category of sets equipped with a reflexive binary relation
- category of sets equipped with a symmetric binary relation
- category of sets equipped with a symmetric reflexive binary relation
- category of commutative algebras
- category of commutative monoids
- category of commutative rings
- category of small categories
- category of cochain complexes of abelian groups
- category of compact Hausdorff spaces
- category of F(I)-sets
- category of filtered vector spaces
- category of finite-dimensional vector spaces [countable field]
- category of finitely generated free abelian groups
- category of finitely generated free modules over Z x Z
- category of groups
- category of Jónsson-Tarski algebras
- category of locally ringed spaces
- category of M-sets
- category of metric spaces with continuous maps
- category of extended metric spaces
- category of monoids
- category of sets with a distinguished subset
- category of partially ordered sets
- category of preordered sets
- category of quivers
- 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 sequences of sets
- category of sets
- category of pointed sets
- category of set functions and commutative squares
- category of pairs of sets
- category of sheaves
- category of abelian sheaves
- category of torsion abelian groups
- category of torsion-free abelian groups
- category of vector spaces
- category of large families of vector spaces which are mostly zero
- category of Z-sets
- category of graded abelian groups
- category of graded modules over a graded ring
- category of simplicial sets