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Boundedness of Marcinkiewicz functions.

Minako SakamotoKôzô Yabuta — 1999

Studia Mathematica

The L p boundedness(1 < p < ∞) of Littlewood-Paley’s g-function, Lusin’s S function, Littlewood-Paley’s g * λ -functions, and the Marcinkiewicz function is well known. In a sense, one can regard the Marcinkiewicz function as a variant of Littlewood-Paley’s g-function. In this note, we treat counterparts μ S ϱ and μ λ * , ϱ to S and g * λ . The definition of μ S ϱ ( f ) is as follows: μ S ϱ ( f ) ( x ) = ( ʃ | y - x | < t | 1 / t ϱ ʃ | z | t Ω ( z ) / ( | z | n - ϱ ) f ( y - z ) d z | 2 ( d y d t ) / ( t n + 1 ) ) 1 / 2 , where Ω(x) is a homogeneous function of degree 0 and Lipschitz continuous of order β (0 < β ≤ 1) on the unit sphere S n - 1 , and ʃ S n - 1 Ω ( x ' ) d σ ( x ' ) = 0 . We show that...

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