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Combinatorics

Addition principle
Counting principle in combinatorics
Algebraic combinatorics
Application of abstract algebra to combinatorics problems
Binomial coefficient
Positive integers that occur as coefficients in the binomial theorem
Combination
Selection of items from a collection
Combinatorial principles
Combinatorial methods used in combinatorics, a branch of mathematics
Combinatorics
Branch of discrete mathematics
Double counting (proof technique)
Type of proof technique
Enumerative combinatorics
Area of combinatorics that deals with the number of ways certain patterns can be formed
Inclusion–exclusion principle
Counting technique in combinatorics
Lah number
Mathematical sequence
Latin square
Square array with symbols that each occur once per row and column
Method of distinguished element
Method in enumerative combinatorics
Mutually orthogonal Latin squares
Mathematical problem
Partial permutation
Selection of some objects in a particular order
Pascal's triangle
Triangular array of the binomial coefficients in mathematics
Permutation
Change of ordering in a (mathematical) set
Pigeonhole principle
If there are more items than boxes holding them, one box must contain at least two items
Ramsey theory
Branch of mathematics that studies the conditions under which order must appear
Rule of division (combinatorics)
Counting principle
Rule of product
Combinatorial principle to determine possible ways to match disjoint sets.
Stirling number
Important sequences in combinatorics
Stirling numbers of the first kind
Numbers important in combinatorics
Stirling numbers of the second kind
Numbers parameterizing ways to partition a set
Twelvefold way
Systematic classification of 12 related enumerative problems concerning two finite sets