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该文定义了一类极大算子:角向H-L极大算子,如M<sub>1</sub><sup>+</sup>f(x)=sup k】01/h<sup>n</sup> integral from x<sub>1</sub> to x<sub>1</sub>+k…integral from x<sub>1</sub> to x<sub>1</sub>+k|f