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math.NT2013★ 11 cited
Conditional expanding bounds for two-variables functions over prime fields
Norbert Hegyvári, François Hennecart
In this paper we provide in $\bFp$ expanding lower bounds for two variables functions in connection with the product set or the sumset. The sum-product problem has been hu…
math.NT2012★ 1 cited
A note on Freiman models in Heisenberg groups
Norbert Hegyvári, François Hennecart
Green and Ruzsa recently proved that for any , any small squaring set in a (multiplicative) abelian group, i.e. , has a Freiman -model: it means that…