On Borel maps, calibrated $\sigma$-ideals and homogeneity

Roman Pol, Piotr Zakrzewski

Let $\mu$ be a Borel measure on a compactum $X$. The main objects in this paper are $\sigma$-ideals $I(dim)$, $J_0(\mu )$, $J_f(\mu )$ of Borel sets in $X$ that can be covered by countably many…