finite products
A category has finite products if it has products for finite families of objects. Equivalently, it has a terminal object and binary products.
- Dual property: finite coproducts
- Related properties: binary products, products, terminal object
- nLab Link
Relevant implications
- additive is equivalent to finite products andpreadditive
- biproducts implies finite coproducts andfinite products andzero morphisms
- cartesian closed implies finite products
- codistributive implies finite coproducts andfinite products
- coextensive implies finite products
- cofiltered limits andfinite products implies products
- countable products implies finite products
- disjoint finite products implies finite products
- distributive implies finite coproducts andfinite products
- essentially finite andfinite products implies products andthin
- extensive andfinite products implies distributive
- finite coproducts andpreadditive implies finite products
- finite coproducts andself-dual implies finite products
- finite products andinfinitary extensive implies infinitary distributive
- finite products andpreadditive implies finite coproducts
- finite products andself-dual implies finite coproducts
- finite products andsequential limits implies countable products
- finite products is equivalent to binary products andterminal object
- finitely complete is equivalent to equalizers andfinite products
- infinitary distributive implies coproducts andfinite products
- products implies countable products andfinite products
Examples
There are 49 categories with 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 finite abelian groups
- category of finite sets
- 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
- dual of the category of sets
- poset [0,1]
- poset of extended natural numbers
- proset of integers w.r.t. divisibility
- trivial category
- walking commutative square
- walking composable pair
- walking isomorphism
- walking morphism
Counterexamples
There are 16 categories without this property.
- category of fields
- category of finite orders
- category of finite sets and bijections
- category of finite sets and injections
- category of finite sets and surjections
- 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
- discrete category on two objects
- empty category
- poset of natural numbers
- poset of ordinal numbers
- walking fork
- walking parallel pair of morphisms
- walking span
Unknown
There are 0 categories for which the database has no information on whether they satisfy this property.
—