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Proceedings of the American Mathematical Society

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The additivity of porosity ideals

Author: Jörg Brendle
Journal: Proc. Amer. Math. Soc. 124 (1996), 285-290
MSC (1991): Primary 03E05
MathSciNet review: 1285976
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Abstract: We show that several $\sigma$-ideals related to porous sets have additivity $\omega_1$ and cofinality $2^\omega$. This answers a question addressed by Miroslav Repický.

References [Enhancements On Off] (What's this?)

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Additional Information

Jörg Brendle
Affiliation: Department of Mathematics, Bar-Ilan University, 52900 Ramat-Gan, Israel
Address at time of publication: Mathematisches Institut der Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany

Keywords: Porous sets, cardinal invariants
Received by editor(s): June 22, 1993
Received by editor(s) in revised form: July 15, 1994
Communicated by: Andreas R. Blass
Article copyright: © Copyright 1996 American Mathematical Society