_:ndbb69093fda7445a9e5d19de2ab3f52axb0
<http://schema.org/description>
"Combinatorics is a branch of mathematics concerning the study of finite or countable discrete structures. Combinatorial problems arise in many areas of pure mathematics, notably in algebra, probability theory, topology, and geometry, and combinatorics also has many applications in mathematical optimization, computer science, ergodic theory and statistical physics."
<https://math.libretexts.org/Bookshelves/Combinatorics_and_Discrete_Mathematics>