## subobject

Noun

(*plural* subobjects)

- (category theory) Given an object
*B*, a*subobject*of it is an equivalence class of objects which relate to*B*through monomorphisms . (If a pair of monomorphisms with codomain*B*factor through each other, then their domains are isomorphic and thus belong to an equivalence class which defines a*subobject*of*B*). The*subobject*generalizes its interpretation in category Set as a set which is a subset (though an inclusion map, which is a monomorphism) of another set.

Origin

*sub-* + *object*