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# Reverse triangle inequality. Antinorms and semi-antinorms

Studia Scientiarum Mathematicarum Hungarica
Authors: Maria Moszyńska and Wolf-Dieter Richter

The paper concerns a biunique correspondence between some positively homogeneous functions on ℝn and some star-shaped sets with nonempty interior, symmetric with respect to the origin (Theorems 3.5 and 4.3).

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# Максимальная функция на дуальной гипергруппе Лагерра

Analysis Mathematica
Authors: Assal Miloud, Rahmouni Atef, and Taieb Ahmed

## Abstract

In this paper, we are interested in the Laguerre hypergroup

\documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $$\mathbb{K} = [0,\infty ) \times \mathbb{R}$$ \end{document}
which is the fundamental manifold of the radial function space for the Heisenberg group. So, we consider the generalized shift operator generated by the dual of the Laguerre hypergroup
\documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $$\bigcup\limits_{j \in \mathbb{N}} {\left\{ {(\lambda ,\mu ) \in \mathbb{R}^2 :\mu = \left| \lambda \right|(2j + \alpha + 1),\lambda \ne 0} \right\} \cup \left\{ {(0,\mu ) \in \mathbb{R}^2 :\mu \geqslant 0} \right\}} ,$$ \end{document}
by means of which the maximal function is investigated. For 1 < p, the L p()-boundedness and weak L 1()-boundedness result for the maximal function is obtained.

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# Coarse space construction based on Chebyshev polynomials for graphic analysis

Pollack Periodica
Authors: Frédéric Magoulès and Guillaume Gbikpi-Benissan

and compactly supported radial functions of minimal degree, Advances in Computational Mathematics , No. 4, 1995, pp. 389–396. Wendland H. Piecewise polynomial, positive definite and

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