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math.GN2019
Families of feebly continuous functions and their properties
Marek Balcerzak, Tomasz Natkaniec, Małgorzata Terepeta
Let . The notions of feebly continuity and very feebly continuity of at a point were considered by I. Lead…
math.GN2019
A lower density operator for the Borel algebra
Marek Balcerzak, Szymon Głab
We prove that the existence of a Borel lower density operator (a Borel lifting) with respect to the -ideal of countable sets, for an uncountable Polish space, is equivalent to t…