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Spaces of largest Hausdorff dimension

Published online by Cambridge University Press:  26 February 2010

Christoph Bandt
Affiliation:
Mathematics Department, Addis Ababa University, POB 1176, Addis Ababa, Ethiopia.
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A metric space (X, ρ) is called precompact, if, for every ε > 0, there is a finite ε-cover (a covering by sets of diameter ≤ ε). The space (X, ρ) is separable if for every e there is a countable ε-cover. There should be some in-between condition. We say that (X, ρ) has fine covers, if, for every ε > 0, there exists a countable ε-cover (U1, U2, …), such that the diameter ∂(Ui) tends to zero as i → ∞. In fact, Goodey [1] has related this property to Hausdorff dimension. We show that a space with fine covers need not be σ-precompact and that on any complete metrizable non-σ-compact space X there is a metric ρ* such that (X, ρ*) has no fine cover.

Type
Research Article
Copyright
Copyright © University College London 1981

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References

1.Goodey, P. R.. “Generalized Hausdorff dimension”, Mathematika, 17 (1970), 324327.CrossRefGoogle Scholar
2.Hausdorff, F.. “Dimension und äusseres Mass”, Math. Ann., 79 (1919), 157179.CrossRefGoogle Scholar
3.Hurewicz, W. and Wallman, H.. Dimension theory (Princeton, 1941).Google Scholar
4.Kahnert, D.. “Hausdorff-Masse von Summenmengen I”, J. reine angew. Math., 264 (1973), 123.Google Scholar
5.Larman, D. G.. “A new theory of dimension”, Proc. London Math. Soc. (3), 17 (1967), 178192.CrossRefGoogle Scholar
6.Rogers, C. A.. Hausdorff measures (Cambridge, 1970).Google Scholar
7.Wegmann, H.. “Die Hausdorff-Dimension von kartesischen Produkten metrischer Räume”, J. reine angew. Math., 246 (1971), 4675.Google Scholar