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Transactions of the American Mathematical Society

Published by the American Mathematical Society since 1900, Transactions of the American Mathematical Society is devoted to longer research articles in all areas of pure and applied mathematics.

ISSN 1088-6850 (online) ISSN 0002-9947 (print)

The 2020 MCQ for Transactions of the American Mathematical Society is 1.48.

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Estimates for some Kakeya-type maximal operators
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by Jose Barrionuevo PDF
Trans. Amer. Math. Soc. 335 (1993), 667-682 Request permission

Abstract:

We use an abstract version of a theorem of Kolmogorov-Seliverstov-Paley to obtain sharp ${L^2}$ estimates for maximal operators of the form: \[ {\mathcal {M}_\mathcal {B}}f(x) = \sup \limits _{x \in S \in \mathcal {B}} \frac {1}{{|S|}}\int _S {|f(x - y)|dy} \] . We consider the cases where $\mathcal {B}$ is the class of all rectangles in ${{\mathbf {R}}^n}$ congruent to some dilate of ${[0,1]^{n - 1}} \times [0,{N^{ - 1}}]$; the class congruent to dilates of ${[0,{N^{ - 1}}]^{n - 1}} \times [0,1]$ ; and, in ${{\mathbf {R}}^2}$ , the class of all rectangles with longest side parallel to a particular countable set of directions that include the lacunary and the uniformly distributed cases.
References
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Additional Information
  • © Copyright 1993 American Mathematical Society
  • Journal: Trans. Amer. Math. Soc. 335 (1993), 667-682
  • MSC: Primary 42B25; Secondary 47B38
  • DOI: https://doi.org/10.1090/S0002-9947-1993-1150012-9
  • MathSciNet review: 1150012