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math.GN2022
Baire Category Lower Density Operators with Borel Values
Marek Balcerzak, Jacek Hejduk, Artur Wachowicz
We prove that the lower density operator associated with the Baire category density points in the real line has Borel values of class which is analogous to the measure…
math.GN2021
On Urysohn's Lemma for generalized topological spaces in ZF
Jacek Hejduk, Eliza Wajch
A strong generalized topological space is an ordered pair such that is a set and is a collection of subsets of such…