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math.CO2025
Polynomial actions of rings of integers of global fields and quasirandomness of Paley-type graphs
Ethan Ackelsberg, Vitaly Bergelson
The goal of this paper is to undertake an in-depth study of the phenomenon behind the Furstenberg--Sárközy theorem, which, in its modern form due to Kamae and Mendès-France, states…
math.CO2025
Infinite polynomial patterns in large subsets of the rational numbers
Ethan Ackelsberg
Inspired by a question of Kra, Moreira, Richter, and Robertson, we prove two new results about infinite polynomial configurations in large subsets of the rational numbers. First, g…
math.CO2024
Counterexamples to generalizations of the Erdős problem
Ethan Ackelsberg
Following their resolution of the Erdős problem, Kra Moreira, Richter, and Robertson posed a number of questions and conjectures related to infinite configurations in posit…