category

Hence there was a category consisting of all groups and all maps between them that preserve multiplication, and there was another category of all topological spaces and all continuous maps between them. To do algebraic topology was to transfer a problem posed in one category (that of topological spaces)…

The important notion of a category was introduced by Samuel Eilenberg and Saunders Mac Lane at the end of World War II. These modern categories must be distinguished from Aristotle’s categories, which are better called types in the present context. A category has not only objects but also arrows (referred…