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math.CO2023
Exponentiations of ultrafilters
Lorenzo Luperi Baglini
In recent years, several problems regarding the partition regularity of exponential configurations have been studied in the literature, in some cases using the properties of specif…
math.LO2023★ 2 cited
Self-divisible ultrafilters and congruences in
Mauro Di Nasso, Lorenzo Luperi Baglini, Rosario Mennuni +2
We introduce self-divisible ultrafilters, which we prove to be precisely those such that the weak congruence relation introduced by Šobot is an equivalence relation…