Cardinal invariants of Haar null and Haar meager sets

Márton Elekes, Márk Poór

A subset $X$ of a Polish group $G$ is \emph{Haar null} if there exists a Borel probability measure $\mu$ and a Borel set $B$ containing $X$ such that $\mu (gBh)=0$ for every $g,h\in G$…