1. School of Mathematics and Statistics,Anhui Normal University,Wuhu 241002,Anhui,China
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Abstract
Let Z/mZ be the ring of residual classes modulo m,and let A and B be nonempty subsets of Z/mZ.In this paper,the authors give the structure of A and B for which|A+B|=|A|+|B|-1=m-2.
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