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We prove some weighted $L_p$ estimates for generalized harmonic extensions in the half-space.

Classical Analysis and ODEs · Mathematics 2019-03-08 Roberta Musina , Alexander I. Nazarov

We extend in two directions the notion of perturbations of Carleson type for the Dirichlet problem associated to an elliptic real second-order divergence-form (possibly degenerate, not necessarily symmetric) elliptic operator. First, in…

Analysis of PDEs · Mathematics 2022-07-28 Joseph Feneuil , Bruno Poggi

We study harmonic functions for general Dirichlet forms. First we review consequences of Fukushima's ergodic theorem for the harmonic functions in the domain of the $ L^{p} $ generator. Secondly we prove analogues of Yau's and Karp's…

Functional Analysis · Mathematics 2021-08-27 Bobo Hua , Matthias Keller , Daniel Lenz , Marcel Schmidt

In this paper, we consider $L^p$- estimate for a class of oscillatory integral operators satisfying the Carleson-Sj\"olin conditions with further convex and straight assumptions. As applications, the multiplier problem related to a general…

Analysis of PDEs · Mathematics 2022-01-05 Chuanwei Gao , Jingyue Li , Liang Wang

We prove $L^p$ bounds for partial polynomial Carleson operators along monomial curves $(t,t^m)$ in the plane $\mathbb{R}^2$ with a phase polynomial consisting of a single monomial. These operators are "partial" in the sense that we consider…

Classical Analysis and ODEs · Mathematics 2017-10-31 Shaoming Guo , Lillian B. Pierce , Joris Roos , Po-Lam Yung

The optimal $L^p \to L^q$ mapping properties for the (local) helical maximal function are obtained, except for endpoints. The proof relies on tools from multilinear harmonic analysis and, in particular, a localised version of the…

Classical Analysis and ODEs · Mathematics 2023-05-29 David Beltran , Jennifer Duncan , Jonathan Hickman

We prove L^p estimates for a class of two-dimensional multilinear forms that naturally generalize (dyadic variants of) both classical paraproducts and the twisted paraproduct introduced in [5] and studied in [1] and [6]. The method we use…

Classical Analysis and ODEs · Mathematics 2012-07-24 Vjekoslav Kovač

We extend the $L^p$-theory of the Boltzmann collision operator by using classical techniques based in the Carleman representation and Fourier analysis, allied to new ideas that exploit the radial symmetry of this operator. We are then able…

Analysis of PDEs · Mathematics 2011-06-06 Emanuel Carneiro , Ricardo J. Alonso

We prove a T(1) Theorem to completely characterize compactness of Calderon-Zygmund operators. The result provides sufficient and necessary conditions for the compactness of singular integral operators acting on L^p(R).

Classical Analysis and ODEs · Mathematics 2014-10-08 Paco Villarroya

We prove the boundedness of the maximal operator and Hilbert transform along certain variable parabolas in $L^p$ for $p>p_0$ with some $p_0\in (1, 2)$. Connections with the Hilbert transform along vector fields and the polynomial Carleson's…

Classical Analysis and ODEs · Mathematics 2015-05-04 Shaoming Guo

It is shown that the Bellman function method can be applied to study the $L^p$-norms of general operators on martingales, i.e., of operators that are not necessarily martingale transforms. Informally, we provide a single Bellman-type…

Functional Analysis · Mathematics 2023-12-04 Viacheslav Borovitskiy , Nikolay N. Osipov , Anton Tselishchev

We establish sharp $L^p$ integral mean estimates for $(\alpha,\beta)$-harmonic functions on the unit disk. Explicit bounds for the functions and their partial derivatives are obtained in terms of boundary data, by means of the associated…

Complex Variables · Mathematics 2026-03-13 Zhi-Gang Wang , Brindha Valson E , R. Vijayakumar

Suppose that $1<p\leq\infty$ and $\varphi\in L^{p}(\mathbb{B}^{n},\mathbb{R}^{n}).$ In this note, we use H\"{o}lder inequality and some basic properties of hypergeometric functions to establish the sharp constant $C_{p}$ and function…

Complex Variables · Mathematics 2025-10-07 Deguang Zhong , Fangming Cai , Dongping Wei

We study maximal averages associated with singular measures on $\rr$. Our main result is a construction of singular Cantor-type measures supported on sets of Hausdorff dimension $1 - \epsilon$, $0 \leq \epsilon < {1/3}$ for which the…

Classical Analysis and ODEs · Mathematics 2019-12-19 Izabella Laba , Malabika Pramanik

We prove several off-diagonal and pointwise estimates for singular integral operators that extend compactly on $L^{p}(\mathbb R^{n})$.

Classical Analysis and ODEs · Mathematics 2017-07-11 Paco Villarroya

Almost everywhere convergence on the solution of Schr\"odinger equation is an important problem raised by Carleson in harmonic analysis. In recent years, this problem was essentially solved by building the sharp $L^p$-estimate of…

Analysis of PDEs · Mathematics 2023-12-12 Zhenbin Cao , Changxing Miao , Meng Wang

In the present paper, we study the regularity of the Andersson-Samuelsson Koppelman integral operator on the $A_1$-singularity. Particularly, we prove $L^p$- and $C^0$-estimates. As applications, we obtain $L^p$-homotopy formulas for the…

Complex Variables · Mathematics 2017-05-30 Richard Lärkäng , Jean Ruppenthal

Stein and Wainger proved the $L^p$ bounds of the polynomial Carleson operator for all integer-power polynomials without linear term. In the present paper, we partially generalise this result to all fractional monomials in dimension one.…

Classical Analysis and ODEs · Mathematics 2015-03-17 Shaoming Guo

We develop a theory of Lp spaces based on outer measures rather than measures. This theory includes the classical Lp theory on measure spaces as special case. It also covers parts of potential theory and Carleson embedding theorems. The…

Classical Analysis and ODEs · Mathematics 2014-08-25 Yen Do , Christoph Thiele

We provide lower $L^q$ and weak $L^p$-bounds for the localized dyadic maximal operator on $R^n$, when the local $L^1$ and the local $L^p$ norm of the function are given. We actually do that in the more general context of homo- geneous…

Classical Analysis and ODEs · Mathematics 2015-11-23 Antonios D. Melas , Eleftherios N. Nikolidakis