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We provide some new estimates for Bellman type functions for the dyadic maximal opeator on $R^n$ and of maximal operators on martingales related to weighted spaces. Using a type of symmetrization principle, introduced for the dyadic maximal…

Functional Analysis · Mathematics 2015-11-24 Antonios D. Melas , Eleftherios N. Nikolidakis , Dimitrios Cheliotis

We obtain sharp estimates for the quasi norm of the maximal function of f when it satisfies certain conditions.

Functional Analysis · Mathematics 2010-01-28 Eleftherios N. Nikolidakis

We obtain sharp estimates for the localized distribution function of M\phi, when \phi belongs to Lp,\inf where M is the dyadic maximal operator. We obtain these estimates given the L1 and Lq norm, q < p and certain weak Lp-conditions.

Functional Analysis · Mathematics 2014-04-01 Eleftherios Nikolidakis

We study properties for the sharp upper bound for integral quantities related to the Bellman function of three integral variables of the dyadic maximal operator, that is determined in [11].

Classical Analysis and ODEs · Mathematics 2025-01-22 Eleftherios N. Nikolidakis

We prove a sharp integral inequality for the dyadic maximal operator, connecting integrals of $\phi$, and of the dyadic maximal function of $\phi$.

Classical Analysis and ODEs · Mathematics 2017-02-07 Anastasios D. Delis , Eleftherios N. Nikolidakis

We obtain sharp upper bounds for integral quantities related to the Bellman function of three integral variables of the dyadic maximal operator.

Classical Analysis and ODEs · Mathematics 2023-12-12 Eleftherios Nikolidakis

We compute the Bellman function of three integral variables associated to the dyadic maximal operator on a subset of its domain. Additionally, we provide an upper bound for the whole domain of its definition.

Functional Analysis · Mathematics 2017-02-07 Anastasios D. Delis , Eleftherios N. Nikolidakis

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

We give an alternative proof of a sharp generalization of an integral inequality for the dyadic maximal operator due to which the evaluation of the Bellman function of this operator with respect to two variables, is possible. This last…

Classical Analysis and ODEs · Mathematics 2016-04-12 Eleftherios N. Nikolidakis

We prove a sharp integral inequality for the dyadic maximal operator due to which the evaluation of the Bellman function of this operator with respect to two variables is possible, as can be seen in [3]. Our inequality of interest is proved…

Functional Analysis · Mathematics 2019-09-23 Eleftherios N. Nikolidakis

We prove sharp $L^1$ inequalities for the dyadic maximal function $M_T\phi$ when $\phi$ satisfies certain $L^1$ and $L^{\infty}$ conditions

Classical Analysis and ODEs · Mathematics 2022-03-09 Eleftherios N. Nikolidakis , Andreas G. Tolias

We prove a sharp integral inequality for the dyadic maximal operator and give as an application another proof for the computation of its Bellman function of three variables.

Functional Analysis · Mathematics 2014-04-01 Eleftherios Nikolidakis , Antonios Melas

We prove a sharp multiparameter integral inequality for the dyadic maximal operator which refines the one-parameter inequality that is given by A.Melas in [4] which in turn is applied for the evaluation of the Bellman function of two…

Functional Analysis · Mathematics 2025-10-28 Eleftherios N. Nikolidakis

We provide an alternative proof and expression of the Bellman function of the dyadic maximal operator in connection with the Dyadic Carleson Imbedding Theorem, which appears in [10]. We also evaluate the Bellman function of four variables…

Functional Analysis · Mathematics 2022-11-15 Eleftherios N. Nikolidakis

For p>1 we find the Bellman function of two variables associated with the dyadic maximal operator on Rn.Actually we do that in the more general setting of tree-like maximal operators.We provide a simple and elementary proof,different from…

Functional Analysis · Mathematics 2014-04-01 Eleftherios N. Nikolidakis , Antonios D. Melas

We prove that the extremal sequences for the Bellman function of the dyadic maximal operator behave approximately as eigenfunctions of this operator for a specific eigenvalue. We use this result to prove the analogous one with respect to…

Functional Analysis · Mathematics 2019-10-15 Eleftherios Nikolidakis

We precisely compute the Bellman function of two variables of the dyadic maximal operator in relation to Kolmogorov inequality. In this way we give an alternative proof of the results in [5].Additionally, we characterize the sequences of…

Functional Analysis · Mathematics 2014-04-01 Eleftherios Nikolidakis

In this paper we give the complete characterization of the boundedness of the generalized fractional maximal operator $$ M_{\phi,\Lambda^{\alpha}(b)}f(x) : = \sup_{Q \ni x} \frac{\|f \chi_Q\|_{\Lambda^{\alpha}(b)}}{\phi (|Q|)} \qquad (x \in…

Functional Analysis · Mathematics 2020-02-05 Rza Mustafayev , Nevin Bilgiçli

We give a new proof of the sharp one weight $L^p$ inequality for any operator $T$ that can be approximated by Haar shift operators such as the Hilbert transform, any Riesz transform, the Beurling-Ahlfors operator. Our proof avoids the…

Classical Analysis and ODEs · Mathematics 2014-05-14 David Cruz-Uribe , Jose Maria Martell , Carlos Perez

We provide a description for the Bellman function related to the Carleson Imbedding theorem, first mentioned in [4], with the use of the Hardy operator.

Functional Analysis · Mathematics 2019-05-20 Eleftherios N. Nikolidakis
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