Nonzero squares in F_q (q>13 odd prime power) cannot be a restricted sumset A hat+ A; generalizations to subgroups over fields and perfect powers over integers, plus a van Lint-MacWilliams analogue.
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Restricted sumsets in multiplicative subgroups
Nonzero squares in F_q (q>13 odd prime power) cannot be a restricted sumset A hat+ A; generalizations to subgroups over fields and perfect powers over integers, plus a van Lint-MacWilliams analogue.