 Subobject

A subobject of $A$ is an isomorphism class of monomorphisms into $A$. A quotient object is dually an isomorphism class of epimorphisms out of $A$.

A subobject is a term used in various fields such as mathematics, computer science, and programming, and its meaning can vary depending on the context. Here are a few interpretations: 1. **Mathematics**: In category theory, a subobject is a generalization of the concept of a subset. It refers to a monomorphism (injective morphism) from one object to another, essentially capturing the notion of a "part" of an object in a categorical framework.