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The higher order Riesz transform for Gaussian measure need not be of weak type (1,1)

Liliana ForzaniRoberto Scotto — 1998

Studia Mathematica

The purpose of this paper is to prove that the higher order Riesz transform for Gaussian measure associated with the Ornstein-Uhlenbeck differential operator L : = d 2 / d x 2 - 2 x d / d x , x ∈ ℝ, need not be of weak type (1,1). A function in L 1 ( d γ ) , where dγ is the Gaussian measure, is given such that the distribution function of the higher order Riesz transform decays more slowly than C/λ.

L p boundedness of Riesz transforms for orthogonal polynomials in a general context

Liliana ForzaniEmanuela SassoRoberto Scotto — 2015

Studia Mathematica

Nowak and Stempak (2006) proposed a unified approach to the theory of Riesz transforms and conjugacy in the setting of multi-dimensional orthogonal expansions, and proved their boundedness on L². Following them, we give easy to check sufficient conditions for their boundedness on L p , 1 < p < ∞. We also discuss the symmetrized version of these transforms.

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