Baire Category Lower Density Operators with Borel Values

Abstract

AbstractWe prove that the lower density operator associated with the Baire category density points in the real line has Borel values of class $$\pmb \Pi ^0_3$$ Π 3 0 which is analogous to the measure case. We also introduce the notion of the Baire category density point of a subset with the Baire property of the Cantor space, and we prove that it generates a lower density operator with Borel values of class $$\pmb \Pi ^0_3$$ Π 3 0 .