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Problem 58

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58) Gibt es in einer Menge E von der Mächtigkeit ℵ1 ein abzählbares System von Teilmengen A 1 , A2,... derart, dass man in der Gestalt

$$ X = \overline {\lim } A_{p_\mu } $$

(p 1 , p 2 ,... Teilfolge der natürlichen Zahlen, lim bedeutet das Borelsche ensemble limite complet) alle Teilmengen X von E erhält? (Es handelt sieh, die Verneinung ohne Benutzung der Kontinuumhypothese zu beweisen).

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References

  1. Sierpiński, W.: Sur un probleme de M. Hausdorff. Fundamenta Math. 30 (1938), 1–7.

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  2. Shelah, S.: Whitehead groups may not be free, even assuming CH, II. Israel Journal of Mathematics 35 (1980), 257–285.

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© 2008 Springer-Verlag Berlin Heidelberg

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(2008). Problem 58. In: Gesammelte Werke. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-76807-4_10

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