For finite sets in an abelian group and a bipartite graph , the restricted sumset is . It retains only sums corresponding to graph edges.
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A **restricted sumset** is a concept used in additive combinatorics, a branch of mathematics that studies various properties of sets of numbers, particularly in relation to addition. Given two sets \(A\) and \(B\) of integers, the **sumset** \(A + B\) is defined as the set of all possible sums obtained by taking one element from \(A\) and one element from \(B\).