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On the dimension of ordered spaces

  • Autores: Bernard Brunet
  • Localización: Collectanea mathematica, ISSN 0010-0757, Vol. 48, Fasc. 3, 1997, págs. 303-314
  • Idioma: inglés
  • Enlaces
  • Resumen
    • In this paper, we prove that, for every ordered space (ordered set with its order topology i.e. with the topology generated by the family of all intervals $]\leftarrow, a[$ and $]a,\rightarrow [)$ and more generally for every line (space homeomorphic to a subspace of an ordered space and called in (7) generalized ordered space), the small inductive dimension (\textit{ind}), the large inductive dimension (\textit{Ind}), the covering dimension (\textit{dim}) and the nonstandard definition or thickness (\textit{ep}) coincide. More precisely, we prove, that for every line $X\not=\emptyset$, we have: \begin{enumerate}[1.)] \item $ep X = ind X = Ind X = dim X = 0$ if and only if $X$ is totally disconnected. \item $ep X = ind X = Ind X = dim X = 1$ if and only if $X$ is not totally disconnected\end{enumerate}.

  • Referencias bibliográficas
    • N. Bourbaki, Topologie générale, Fasc. II, chap. I et II, Hermann 1971.
    • B. Brunet, On the thickness of topological spaces, Annales Mathématiques Blaise Pascal 2 n°2 (1995), 25–33.
    • B. Brunet, Dimension d’Alexandroff d’un espace uniforme, to appear in Riv. Mat. Pura Appl.
    • B. Brunet, On the compactification of lines, to appear.
    • R. Engelking, Dimension Theory, North-Holland 1978.
    • H. Herrlich, Ordnungsfähigkeit total-discontinuierlicher Räume, Math. Ann. 159 (1965), 77–80.
    • D. J. Lutzer, Ordered topological spaces, Surveys in General Topology, Academic Press (1980), 247–295.
    • P. Roy, Nonequality of dimension for metric spaces, Trans. Amer. Math. Soc. 134 (1968), 117–132.
    • W. Sierpinski, Sur les ensembles connexes et non connexes, Fund. Math. 2 (1921), 81–95.
    • Lynn A. Steen, A direct proof that a linearly ordered space is hereditarily collectionwise normal, Proc. Amer. Math. Soc. 24 (1970), 727–728.

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