From Citizendium, the Citizens' Compendium
- Please sort and annotate in a user-friendly manner. For formatting, consider using automated reference wikification.
Kechris, A.S. (1995), Classical descriptive set theory, Graduate texts in Math., vol. 156, Springer-Verlag
(Exercise (27.2) on page 209, Definition (22.9) on page 169, and Exercise (3.4)(ii) on page 14.)