SETS WITH SMALL SUMSET AND RECTIFICATION
SETS WITH SMALL SUMSET AND RECTIFICATION
We study the extent to which sets A in Z/NZ, N prime, resemble sets of integers from the additive point of view (``up to Freiman isomorphism''). We give a direct proof of a result of Freiman, namely that if |A + A| exp(-cK^2 log K). As a byproduct of our …