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Extending classical criteria for differentiation theorems

Published online by Cambridge University Press:  26 February 2010

Flemming Topsøe
Affiliation:
Department of Mathematics, Universitetsparken 5, 2100 Copenhagen Ø, Denmark.
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Abstract

A basic notion in the classical theory of differentiation is that of a differentiation base. However, some differentiation type theorems only require the less restricted notion of a contraction. We demonstrate that the classical criteria, such as the covering criteria of de Possel, continue to hold in the new setting.

Type
Research Article
Copyright
Copyright © University College London 1985

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References

1.de Guzmán, M.. Real Variable Methods in Fourier Analysis, Mathematics Studies 46 (North-Holland, 1981).Google Scholar
2.Jørsboe, O., Mejlbro, L. and Topsøe, F.. Some Vitali type theorems for Lebesgue measure. Math. Scand., 48 (1981), 259285.CrossRefGoogle Scholar
3.Mejlbro, L. and Topsøe, F.. A precise Vitali theorem for Lebesgue measure. Math. Ann., 230 (1977), 183193.CrossRefGoogle Scholar
4.Solovay, R. M.. A model of set theory in which every set of reals is Lebesgue measurable. Annals of Math., 92 (1970), 156.CrossRefGoogle Scholar
5.Topsøe, F.. Packings and Coverings with Balls in finite dimensional Normed Spaces. Lecture Notes in Mathematics 541 (Springer, 1976), 187198.Google Scholar
6.Topsøe, F.. Thin trees and geometrical criteria for Lebesgue nullsets. Lecture Notes in Mathematics 794 (Springer, 1980), 5778.Google Scholar