These notes develop the theory of descriptive sets, leading up to a new proof of Louveau's separation theorem for analytic sets.
Contents
I -- On the length of Borel hierarchies -- Borel Hierarchy -- Abstract Borel hierarchies -- Characteristic function of a sequence -- Martin's Axiom -- Generic G[textdelta] -- [textalpha]-forcing -- Boolean algebras -- Borel order of a field of sets -- CH and orders of separable metric spaces -- Martin-Solovay Theorem -- Boolean algebra of order [textomega] -- Luzin sets -- Cohen real model -- The random real model -- Covering number of an ideal
II -- Analytic sets -- Analytic sets -- Constructible well-orderings -- Hereditarily countable sets -- Shoenfield Absoluteness -- Mansfield-Solovay Theorem -- Uniformity and Scales -- Martin's axiom and Constructibility -- well-orderings -- Large sets