On complete accumulation points of discrete subsets

Ofelia T. Alas

Brazil

Universidade de Sao Paulo

Richard G. Wilson

Mexico

Universidad Autónoma Metropolitana

Departamento de Matemáticas
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Accepted: 2013-11-15

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DOI: https://doi.org/10.4995/agt.2007.1893
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Supporting agencies:

Nacional de Ciencia y Tecnología (México)

grant 38164- E and Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (Brasil)

Abstract:

We introduce a class of spaces in which every discrete subset has a complete accumulation point. Properties of this class are obtained and consistent examples are given to show that this clas sdiffers from the class of countably compact and the class of compact spaces. A number of questions are posed.
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References:

O. T. Alas and R. G. Wilson, Minimal properties between T1 and T2, Houston J. Math. 32, no. 2 (2006), 493–504.

Z. Balogh, A. Dow, D. H. Fremlin and P. J. Nyikos, Countable tightness and proper forcing, Bulletin A.M.S. (N. S.) 19, no. 1 (1988), 295–298.

R. Engelking, General Topology, Heldermann Verlag, Berlin 1989.

V. Fedorcuk, On the cardinality of hereditarily separable compact Hausdorff spaces, Soviet Math. Doklady 16 (1975), 651–655.

L. Gillman and M. Jerison, Rings of Continuous Functions, Van Nostrand, Princeton, 1960. http://dx.doi.org/10.1007/978-1-4615-7819-2

A. Gryzlov, Cardinal invariants and compactifications, Comm. Math. Univ. Carolinae 35, no. 1 (1994), 403–408.

I. Juhasz, Cardinal Funcions in Topology - Ten years later, Mathematical Centre Tracts 123, Mathematisch Centrum, Amsterdam, 1980.

H.-P. Künzi and D. van der Zypen, Maximal (sequentially) compact topologies, preprint, http://arxiv.org/PS cache/math/pdf/0306/0306082.pdf

J. van Mill, An introduction to βω, in Handbook of Set-theoretic Topology, North Holland, Amsterdam, 1984.

A. J. Ostaszewski, On countably compact perfectly normal spaces, J. London Math. Soc. 14 (1976), 501–516.

M. E. Rudin, Lectures on Set Theoretic Topology, CBMS, Regional Conference Series in Mathematics, No. 23, A. M. S., Providence, 1975.

R. M. Stephenson, Initially k-compact and related spaces, in Handbook of Set-theoretic Topology, North Holland, Amsterdam, 1984.

A. Tamariz and R. G. Wilson, Example of a T1 topological space without a Noetherian base, Proceedings A.M.S. 104, no. 1 (1988), 310–312.

V. V. Tkachuk, Spaces that are projective with respect to classes of mappings, Trans. Moscow Math. Soc. 50 (1988), 139–156.

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