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    Article

    Hardy’s inequality for the fractional powers of a discrete Laplacian

    We prove a Hardy inequality for fractional powers of a discrete Laplacian, which can be seen as a generalized fractional version of the classical Hardy inequality in Landau (J Lond Math Soc 1:38–39, 1926). Such ...

    Óscar Ciaurri, Luz Roncal in The Journal of Analysis (2018)

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    Article

    Harmonic analysis associated with a discrete Laplacian

    It is well known that the fundamental solution of $${u_t}\left( {n,t} \right) = u\left( {n + 1,t} \right) - 2u\left( {n,t} \right) + u...

    Óscar Ciaurri, T. Alastair Gillespie, Luz Roncal in Journal d'Analyse Mathématique (2017)

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    Article

    Riesz Transforms on Compact Riemannian Symmetric Spaces of Rank One

    In this paper we prove mixed norm estimates for Riesz transforms related to Laplace–Beltrami operators on compact Riemannian symmetric spaces of rank one. These operators are closely related to the Riesz trans...

    Óscar Ciaurri, Luz Roncal, Pablo Raúl Stinga in Milan Journal of Mathematics (2015)

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    Article

    The Riesz Transform for the Harmonic Oscillator in Spherical Coordinates

    In this paper, we show weighted estimates in mixed norm spaces for the Riesz transform associated with the harmonic oscillator in spherical coordinates. In order to prove the result, we need a weighted inequal...

    Óscar Ciaurri, Luz Roncal in Constructive Approximation (2014)

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    Article

    The spectrum of the right inverse of the Dunkl operator

    From the Dunkl analogue of Gegenbauer’s expansion of the plane wave, we derive an explicit closed formula for the spectrum of a right inverse of the Dunkl operator. This is done by stating the problem in such ...

    Luís Daniel Abreu, Óscar Ciaurri, Juan Luis Varona in Revista Matemática Complutense (2013)

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    Article

    Weighted transplantation for Fourier-Bessel series

    We prove weighted transplantation inequalities for Fourier-Bessel series with weights more general than previously considered power weights. These inequalities follow by using a local version of the Calderón-Z...

    Óscar Ciaurri, Krzysztof Stempak in Journal d’Analyse Mathématique (2006)

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    Article

    A transference theorem for hermite expansions

    A transference theorem for multipliers of Hermite expansions is proved. The result allows to transfer weightedL 2(ℝ n ) estimates from lower to higher dimensions.

    Óscar Ciaurri in Rendiconti del Circolo Matematico di Palermo (2004)