thin
A category is thin when between any pair of objects there is at most one morphism. Such categories correspond to preordered collections.
Relevant implications
- binary coproducts andleft cancellative implies thin
- binary products andright cancellative implies thin
- cocomplete andessentially small andthin implies complete
- coequalizers andgroupoid implies thin
- coequalizers andleft cancellative implies thin
- complete andessentially small andinfinitary distributive andthin implies cartesian closed
- complete andessentially small andthin implies cocomplete
- coproducts andessentially small implies thin
- disjoint finite coproducts andstrict terminal object implies thin
- disjoint finite coproducts andthin implies trivial
- disjoint finite products andstrict initial object implies thin
- disjoint finite products andthin implies trivial
- equalizers andgroupoid implies thin
- equalizers andright cancellative implies thin
- essentially discrete is equivalent to groupoid andthin
- essentially finite andfinite coproducts implies coproducts andthin
- essentially finite andfinite products implies products andthin
- essentially small andproducts implies thin
- finitely cocomplete andthin implies co-Malcev
- finitely cocomplete andthin implies coregular
- finitely complete andthin implies Malcev
- finitely complete andthin implies regular
- inhabited andthin implies cogenerator
- inhabited andthin implies generator
- left cancellative andzero morphisms implies thin
- locally presentable andself-dual implies thin
- regular subobject classifier andstrict terminal object implies thin
- right cancellative andzero morphisms implies thin
- strongly connected andthin implies locally cartesian closed
- subobject classifier andthin implies trivial
- thin implies coequalizers andright cancellative
- thin implies equalizers andleft cancellative
Examples
There are 13 categories with this property.
- discrete category on two objects
- empty category
- poset [0,1]
- poset of extended natural numbers
- poset of natural numbers
- poset of ordinal numbers
- proset of integers w.r.t. divisibility
- trivial category
- walking commutative square
- walking composable pair
- walking isomorphism
- walking morphism
- walking span
Counterexamples
There are 52 categories without this property.
- category of abelian groups
- category of abelian sheaves
- category of algebras
- category of Banach spaces with linear contractions
- category of combinatorial species
- category of commutative algebras
- category of commutative monoids
- category of commutative rings
- category of fields
- category of finite abelian groups
- category of finite orders
- category of finite sets
- category of finite sets and bijections
- category of finite sets and injections
- category of finite sets and surjections
- category of finitely generated abelian groups
- category of free abelian groups
- category of groups
- category of Hausdorff spaces
- category of left modules over a division ring
- category of left modules over a ring
- category of locally ringed spaces
- category of M-sets
- category of measurable spaces
- category of metric spaces with continuous maps
- category of metric spaces with non-expansive maps
- category of metric spaces with ∞ allowed
- category of monoids
- category of non-empty sets
- category of pairs of sets
- category of pointed sets
- category of posets
- category of prosets
- category of rings
- category of rngs
- category of schemes
- category of sets
- category of sets and relations
- category of sheaves
- category of simplicial sets
- category of small categories
- category of smooth manifolds
- category of topological spaces
- category of vector spaces
- category of Z-functors
- delooping of a non-trivial finite group
- delooping of an infinite group
- delooping of the additive monoid of natural numbers
- delooping of the additive monoid of ordinal numbers
- dual of the category of sets
- walking fork
- walking parallel pair of morphisms
Unknown
There are 0 categories for which the database has no information on whether they satisfy this property.
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