Dittert conjecture

Dividing a circle into areas

Dobiński's formula

Equiangular lines

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Erdős conjecture on arithmetic progressions

Erdős sumset conjecture

Erdős–Graham problem

Erdős–Szemerédi theorem

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Extremal Problems For Finite Sets

Extremal combinatorics

Factorial number system

Finite topological space

Frobenius characteristic map

Geometric combinatorics

History of combinatorics

Hook length formula

Incidence structure

Independence system

Index of combinatorics articles

Infinitary combinatorics

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Combinatorics is a branch of mathematics that deals with counting, arrangement, and combination of objects. It involves studying finite or countable discrete structures and provides tools for analyzing the ways in which various elements can be selected, arranged, and combined under specific constraints. Key areas of study within combinatorics include: 1. **Counting Principles**: This involves basic techniques like the rule of sum and rule of product, permutations (arrangements of objects), and combinations (selections of objects).


Combinatorics

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 Children: Combinatorics