scholarly journals Dunkl Translation and Uncentered Maximal Operator on the Real Line

Author(s):  
Chokri Abdelkefi ◽  
Mohamed Sifi

We establish estimates of the Dunkl translation of the characteristic functionχ[−ɛ,ɛ],ɛ>0, and we prove that the uncentered maximal operator associated with the Dunkl operator is of weak type(1,1). As a consequence, we obtain theLp-boundedness of this operator for1<p≤+∞.


Author(s):  
A. L. Bernardis ◽  
F. J. Martín-Reyes

We consider the maximal operator defined on the real line by which is related to the Cesàro convergence of the singular integrals. We characterize the weights w for which Mα is of weak type, strong type and restricted weak type (p, p) with respect to the measure w(x) dx.





2021 ◽  
Vol 164 (1) ◽  
pp. 133-148
Author(s):  
Łukasz Kamiński ◽  
Adam Osękowski






Author(s):  
J. M. Aldaz

We answer questions of A. Carbery, M. Trinidad Menárguez and F. Soria by proving, firstly, that for the centred Hardy–Littlewood maximal function on the real line, the best constant C for the weak type (1, 1) inequality is strictly larger than 3/2, and secondly, that C is strictly less than 2 (known to be the best constant in the noncentred case).



2019 ◽  
Vol 357 (4) ◽  
pp. 339-344 ◽  
Author(s):  
Paata Ivanisvili ◽  
Samuel Zbarsky


Author(s):  
Chokri Abdelkefi

AbstractIn the present paper, we study in the harmonic analysis associated to the Weinstein operator, the boundedness on Lp of the uncentered maximal function. First, we establish estimates for the Weinstein translation of characteristic function of a closed ball with radius ɛ centered at 0 on the upper half space ℝd–1× ]0, +∞ [. Second, we prove weak-type L1-estimates for the uncentered maximal function associated with the Weinstein operator and we obtain the Lp-boundedness of this operator for 1 < p ≤ + ∞. As application, we define a large class of operators such that each operator of this class satisfies these Lp-inequalities. In particular, the maximal operator associated respectively with the Weinstein heat semigroup and the Weinstein-Poisson semigroup belong to this class.



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