Vibeke Quorning

collaborators

2 papers

math.LO2018

Cantor-Bendixson type ranks on Polish spaces

Vibeke Quorning

For any Polish space $X$ it is well-known that the Cantor-Bendixson rank provides a co-analytic rank on $F_{ℵ_{0}} (X)$ if and only if $X$ is a $σ$ -compact. In the case of $ω^{ω}$ …

math.LO2018

Co-induction and Invariant Random Subgroups

Alexander S. Kechris, Vibeke Quorning

In this paper we develop a co-induction operation which transforms an invariant random subgroup of a group into an invariant random subgroup of a larger group. We use this operatio…