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Proceedings of the American Mathematical Society

ISSN 1088-6826(online) ISSN 0002-9939(print)



On tightness and depth
in superatomic Boolean algebras

Authors: Saharon Shelah and Otmar Spinas
Journal: Proc. Amer. Math. Soc. 127 (1999), 3475-3480
MSC (1991): Primary 06E05
Published electronically: May 13, 1999
MathSciNet review: 1610793
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Abstract: We introduce a large cardinal property which is consistent with $L$ and show that for every superatomic Boolean algebra $B$ and every cardinal $\lambda $ with the large cardinal property, if tightness$^{+}(B)\geq \lambda ^{+}$, then depth$(B)\geq \lambda $. This improves a theorem of Dow and Monk.

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Additional Information

Saharon Shelah
Affiliation: Institute of Mathematics, Hebrew University, Givat Ram, 91904 Jerusalem, Israel

Otmar Spinas
Affiliation: Mathematik, ETH-Zentrum, 8092 Zürich, Switzerland

Received by editor(s): November 18, 1997
Received by editor(s) in revised form: February 13, 1998
Published electronically: May 13, 1999
Additional Notes: The first author was supported by the Basic Research Foundation of the Israel Academy of Sciences; publication 663.
The second author was partially supported by the Alexander von Humboldt Foundation and grant 2124-045702.95/1 of the Swiss National Science Foundation.
Communicated by: Carl G. Jockusch, Jr.
Article copyright: © Copyright 1999 American Mathematical Society