Arithmetic progressions in sets with small sumsets
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math.NT
math.CO
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arithmeticprogressionssmallalongcontainsdenseelementaryfinite
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We present an elementary proof that if $A$ is a finite set of numbers, and the sumset $A+_GA$ is small, $|A+_GA|\leq c|A|$, along a dense graph $G$, then $A$ contains $k$-term arithmetic progressions.
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