Presents Results from a Very Active Area of ResearchExploring an active area of mathematics that studies the complexity of equivalence relations and classification problems, Invariant Descriptive Set Theory presents an introduction to the basic concepts, methods, and results of this theory. It brings together techniques from various areas of mathem
Preface. Polish Group Actions. Theory of Equivalence Relations. Countable Model Theory. Applications to Classification Problems. Appendix. References. Index.