Category theory
BRANCH OF MATHEMATICS STUDYING CATEGORIES, FUNCTORS, AND NATURAL TRANSFORMATIONS
CategoryTheory; Category Theory; Category theoretic; Category-theoretic; Categorical point of view; Draft:Applied Category Theory; Object of a category
Category theory is a general theory of mathematical structures and their relations that was introduced by Samuel Eilenberg and Saunders Mac Lane in the middle of the 20th century in their foundational work on algebraic topology. Nowadays, category theory is used in almost all areas of mathematics, and in some areas of computer science.