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Proceedings of the American Mathematical Society

Published by the American Mathematical Society since 1950, Proceedings of the American Mathematical Society is devoted to shorter research articles in all areas of pure and applied mathematics.

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

The 2020 MCQ for Proceedings of the American Mathematical Society is 0.85.

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Partitioning topological spaces into countably many pieces
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by P. Komjáth and W. Weiss PDF
Proc. Amer. Math. Soc. 101 (1987), 767-770 Request permission

Abstract:

We assume $X \to (\operatorname {top}\omega + 1)_\omega ^1$ and determine which larger $\alpha$ can replace $\omega + 1$. If $X$ is first countable, any countable $\alpha$ can replace $\omega + 1$. If the character of $X$ is ${\omega _1}$, it is consistent and independent whether ${\omega ^2} + 1$ can always replace $\omega + 1$. Consistently ${\omega _1}$ cannot replace $\omega + 1$ for any $X$ of size ${\omega _1}$.
References
  • Kenneth Kunen, Set theory, Studies in Logic and the Foundations of Mathematics, vol. 102, North-Holland Publishing Co., Amsterdam-New York, 1980. An introduction to independence proofs. MR 597342
  • William Weiss, Partitioning topological spaces, Mathematics of Ramsey theory, Algorithms Combin., vol. 5, Springer, Berlin, 1990, pp. 154–171. MR 1083599, DOI 10.1007/978-3-642-72905-8_{1}1
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Additional Information
  • © Copyright 1987 American Mathematical Society
  • Journal: Proc. Amer. Math. Soc. 101 (1987), 767-770
  • MSC: Primary 54A25; Secondary 04A20, 05A17
  • DOI: https://doi.org/10.1090/S0002-9939-1987-0911048-6
  • MathSciNet review: 911048