Restricted Sumsets in Finite Nilpotent Groups

Suppose that $A,B$ are two non-empty subsets of the finite nilpotent group $G$. If $A\not=B$, then the cardinality of the restricted sumset $A\dotplus B={a+b: a\in A, b\in B, a\neq b}$ is at least $\min{p(G),|A|+|B|-2},$ where $p(G)$ denotes the least prime factor of $|G|$.

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