(mathematics) a branch of mathematics that studies (usually finite) collections of objects that satisfy specified criteria

Of or pertaining to combinatorics; combinatorial.

By means of, or in terms of, combinatorics.

Relating to combinatorics

(mathematics) A field of mathematics in the intersection of number theory, combinatorics, ergodic theory and harmonic analysis.

(mathematics) A subbranch of combinatorics that concerns additive problems expressed using sumsets.

(algebra, combinatorics) A branch of mathematics in which techniques from abstract algebra are applied to problems in combinatorics, and vice versa.