In this book the authors present their research into the foundations of the theory of Polish groups and the associated orbit equivalence relations. The particul

Presents Results from a Very Active Area of ResearchExploring an active area of mathematics that studies the complexity of equivalence relations and classificat

Descriptive set theory has been one of the main areas of research in set theory for almost a century. This text presents a largely balanced approach to the subj

This book introduces a new research direction in set theory: the study of models of set theory with respect to their extensional overlap or disagreement. In Par

This book comprises five expository articles and two research papers on topics of current interest in set theory and the foundations of mathematics. Articles by