The inverse littlewood-offord problem shows concentration of quadratic forms, suggesting coefficient approximation strategies.
Motivated by the inverse Littlewood-Offord problem for linear forms, we study the concentration of quadratic forms. We show that if this form concentrates on a small ball with high probability, then the coefficients can be approximated by a sum of additive and algebraic structures.
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Hoi H. Nguyen (2012) studied this question.
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