A compact ccc non-separable space from a Hausdorff gap and Martin's Axiom

Murray G. Bell

Commentationes Mathematicae Universitatis Carolinae (1996)

  • Volume: 37, Issue: 3, page 589-594
  • ISSN: 0010-2628

Abstract

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We answer a question of I. Juhasz by showing that MA + ¬ CH does not imply that every compact ccc space of countable π -character is separable. The space constructed has the additional property that it does not map continuously onto I ω 1 .

How to cite

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Bell, Murray G.. "A compact ccc non-separable space from a Hausdorff gap and Martin's Axiom." Commentationes Mathematicae Universitatis Carolinae 37.3 (1996): 589-594. <http://eudml.org/doc/247935>.

@article{Bell1996,
abstract = {We answer a question of I. Juhasz by showing that MA $+ \lnot $ CH does not imply that every compact ccc space of countable $\pi $-character is separable. The space constructed has the additional property that it does not map continuously onto $I^\{\omega _1\}$.},
author = {Bell, Murray G.},
journal = {Commentationes Mathematicae Universitatis Carolinae},
keywords = {ccc; non-separable; Hausdorff gap; $\pi $-character; Martin axiom; separability; compactness},
language = {eng},
number = {3},
pages = {589-594},
publisher = {Charles University in Prague, Faculty of Mathematics and Physics},
title = {A compact ccc non-separable space from a Hausdorff gap and Martin's Axiom},
url = {http://eudml.org/doc/247935},
volume = {37},
year = {1996},
}

TY - JOUR
AU - Bell, Murray G.
TI - A compact ccc non-separable space from a Hausdorff gap and Martin's Axiom
JO - Commentationes Mathematicae Universitatis Carolinae
PY - 1996
PB - Charles University in Prague, Faculty of Mathematics and Physics
VL - 37
IS - 3
SP - 589
EP - 594
AB - We answer a question of I. Juhasz by showing that MA $+ \lnot $ CH does not imply that every compact ccc space of countable $\pi $-character is separable. The space constructed has the additional property that it does not map continuously onto $I^{\omega _1}$.
LA - eng
KW - ccc; non-separable; Hausdorff gap; $\pi $-character; Martin axiom; separability; compactness
UR - http://eudml.org/doc/247935
ER -

References

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  1. Baumgartner J.E., Applications of the Proper Forcing Axiom, Handbook of Set-Theoretic Topology, editors K.Kunen and J.Vaughan, North-Holland, 1984, pp. 913-959. Zbl0556.03040MR0776640
  2. Bell M., Compact ccc non-separable spaces of small weight, Topology Proceedings 5 (1980), 11-25. (1980) MR0624458
  3. Bell M, G κ subspaces of hyadic spaces, Proc. Amer. Math. Soc. 104 , No.2 (1988), 635-640. (1988) MR0962841
  4. Bell M., Spaces of Ideals of Partial Functions, Set Theory and its Applications, Lecture Notes in Mathematics 1401, Springer-Verlag, 1989, pp. 1-4. Zbl0683.54013MR1031761
  5. Fremlin D.H., Consequences of Martin's Axiom, Cambridge Tracts in Mathematics 84, Cambridge University Press, 1984. Zbl1156.03050
  6. Juhasz I., Cardinal Functions in Topology, Mathematical Centre Tracts 34, Mathematisch Centrum, Amsterdam, 1971. Zbl0479.54001MR0340021
  7. Juhasz I., Consistency Results in Topology, Handbook of Mathematical Logic, editor J.Barwise, North-Holland, 1977, pp. 503-522. Zbl0257.54003
  8. Shapirovskii B., On separability and metrizability of spaces with Souslin condition, Soviet Math. Dokl. 13 (1972), 1633-1637. (1972) 
  9. Shapirovskii B., Maps onto Tikhonov cubes, Russ. Math. Surv. 35.3 (1980), 145-156. (1980) 
  10. Shapirovskii B. (presented by P.Nyikos and J.Vaughan), The Equivalence of Sequential Compactness and Pseudoradialness in the Class of Compact T 2 Spaces, Assuming CH, Papers on General Topology and Applications, Annals of the New York Academy of Sciences 704, 1993, pp. 322-327. MR1277868
  11. Todorcevic S., Partition Problems in Topology, Contemporary Mathematics 84, American Mathematical Society, Providence, Rhode Island, 1989. Zbl0659.54001MR0980949
  12. Todorcevic S., Farah I., Some Applications of the Method of Forcing, Yenisey Publ. Co., Moscow, 1995. Zbl1089.03500MR1486583

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