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Potential Wadge classes

About this Title

Dominique Lecomte, Université Paris 6, Institut de Mathématiques de Jussieu, Projet Analyse Fonctionnelle, Couloir 16-26, 4ème étage, Case 247, 4, place Jussieu, 75 252 Paris Cedex 05, France

Publication: Memoirs of the American Mathematical Society
Publication Year: 2013; Volume 221, Number 1038
ISBNs: 978-0-8218-7557-5 (print); 978-0-8218-9459-0 (online)
Published electronically: March 16, 2012
Keywords:Borel classes, potentially, products, reduction, Wadge classes
MSC: Primary 03E15; Secondary 54H05, 28A05, 26A21

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Table of Contents


  • Chapter 1. Introduction
  • Chapter 2. A condition ensuring the existence of complicated sets
  • Chapter 3. The proof of Theorem 1.10 for the Borel classes
  • Chapter 4. The proof of Theorem 1.11 for the Borel classes
  • Chapter 5. The proof of Theorem 1.10
  • Chapter 6. The proof of Theorem 1.11
  • Chapter 7. Injectivity complements


Let $\bf\Gamma $ be a Borel class, or a Wadge class of Borel sets, and $2\!\leq \! d\!\leq \!\omega $ be a cardinal. A Borel subset $B$ of ${\mathbb{R}}^d$ is $potentially$ $in$ $\bf\Gamma $ if there is a finer Polish topology on $\mathbb{R}$ such that $B$ is in $\bf\Gamma $ when ${\mathbb{R}}^d$ is equipped with the new product topology. We give a way to recognize the sets potentially in $\bf\Gamma $. We apply this to the classes of graphs (oriented or not), quasi-orders and partial orders.

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