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Riesz transforms and harmonic Lip1-capacity in Cantor sets

Published online by Cambridge University Press:  05 November 2004

Joan Mateu
Affiliation:
Departament de Matemàtiques, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain. E-mail: mateu@mat.uab.es
Xavier Tolsa
Affiliation:
Institució Catalana de Recerca i Estudis Avançats (ICREA) and Departament de Matemàtiques, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain. E-mail: xtolsa@mat.uab.es
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Abstract

We estimate the $L^2$-norm of the $s$-dimensional Riesz transforms on some Cantor sets in ${\mathbb R}^d$. Towards this end, we show that the Riesz transforms truncated at different scales behave in a quasiorthogonal way. As an application, we obtain some precise numerical estimates for the Lipschitz harmonic capacity of these sets.

Type
Research Article
Copyright
2004 London Mathematical Society

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Footnotes

The authors were partially supported by grants BFM2000-0361, MTM2004-00519, HPRN-2000-0116, and 2001-SGR-00431. X. Tolsa was also supported by the program Ramón y Cajal, MCYT (Spain).