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math.CO2023
New bounds in the Bogolyubov-Ruzsa lemma
Tomasz Kosciuszko, Tomasz Schoen
We establish new bounds in the Bogolyubov-Ruzsa lemma, demonstrating that if A is a subset of a finite abelian group with density alpha, then 3A-3A contains a Bohr set of rank O(lo…
math.NT2023★ 2 cited
Counting solutions to invariant equations in dense sets
Tomasz Kosciuszko
We prove a lower bound of exp(-C (log(2/alpha))^7)N^{k-1} to the number of solutions of an invariant equation in k variables, contained in a set of density alpha. Moreover, we give…