Extremal combinatorics is a branch of combinatorial mathematics that focuses on the study of combinatorial structures and their properties, particularly concerning the maximum or minimum size of a collection of sets or graphs under certain conditions. It seeks to answer questions about how large or small a structure can be while still satisfying specific constraints, and this has deep implications in fields like graph theory and geometry.
congrats on reading the definition of extremal combinatorics. now let's actually learn it.