Ultrafilters on measurable semigroups

A. Pashapournia, M. Akbari Tootkaboni, D. Ebrahimbagha

Let $(S,\cdot )$ be a semigroup and $\mathfrak{m}$ be a $\sigma$-algebra on $S$. We say $(S,\cdot ,\mathfrak{m})$ is a measurable semigroup if $\pi :S\times S⟶S$ by $π(x,y)=x\…