CALIBRATED THIN PI(1)(1) SIGMA-IDEALS ARE G(DELTA)

Authors
ZELENY M
Citation
M. Zeleny, CALIBRATED THIN PI(1)(1) SIGMA-IDEALS ARE G(DELTA), Proceedings of the American Mathematical Society, 125(10), 1997, pp. 3027-3032
Citations number
5
Journal title
Proceedings of the American Mathematical Society → ACNP
ISSN journal
00029939
Volume
125
Issue
10
Year of publication
1997
Pages
3027 - 3032
Database
ISI
SICI code
0002-9939(1997)125:10<3027:CTPSAG>2.0.ZU;2-K
Abstract
Let E be a compact metric space, and let I subset of K(E) be a calibra ted thin Pi(1)(1) sigma-ideal. Then I is G(delta). This solves an open problem, which was posed by Kechris, Louveau and Woodin. Using our re sult we obtain a new proof of Kaufman's theorem concerning U-sets and U-0-sets.