In number theory, the specialty **additive number theory** studies subsets of integers and their behavior under addition. More abstractly, the field of "additive number theory" includes the study of Abelian groups and commutative semigroups with an operation of addition. Additive number theory has close ties to combinatorial number theory and the geometry of numbers. Two principal objects of study are the sumset of two subsets *A* and *B* of elements from an Abelian group *G*,

- ,

and the h-fold sumset of *A*,

There are two main subdivisions listed below.

Read more about Additive Number Theory: Additive Number Theory, Additive Combinatorics

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