Abstract dyadic cubes, maximal operators and Hausdorff content
Abstract dyadic cubes, maximal operators and Hausdorff content
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抽象二进立方、最大算子和 Hausdorff 内容
DOI:
10.1016/j.bulsci.2016.02.001
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发表时间:
2016
影响因子:
1.3
通讯作者:
渡辺俊一
中科院分区:
文献类型:
--
作者:
齋藤洋樹,田中仁;渡辺俊一
Let μ be a locally finite Borel measure and D a family of measurable sets equipped with a certain dyadic structure. For E⊂ R n and 0< α≤ n, by α-dimensional Hausdorff content we mean H μ α (E)= inf∑ j μ (Q j) α/n, where the infimum is taken over all coverings of E by countable families of the abstract dyadic cubes {Q j}⊂ D. In this paper we study the boundedness of the Hardy–Littlewood maximal operator M D μ adapted to D and μ, that is, we prove the strong type (p, p) inequality∫(M D μ f) p d H μ α≤ 2 2 p+ 2 min(1, p)−(α/n)∫| f| p d H μ α for α/n< p<∞, and the weak type (α/n, α/n) inequality H μ α ({x∈ R n: M D μ f (x)> t})≤ 4 (n/α) α/n t− α/n∫| f| α/n d H μ α, t> 0, where the integrals are taken in the Choquet sense.