Abstract:
We continue the study of the sharp Bernstein–Nikolskii constants for spherical polynomials in the space $L^{p}(\mathbb{S}^{d})$ with the Dunkl weight. We consider the model case of the octahedral reflection group $\mathbb{Z}_{2}^{d+1}$ and weight $\prod_{j=1}^{d+1}|x_{j}|^{2\kappa_{j}} $ when the explicit form of the Dunkl intertwining operator is known. We show that for $\min \kappa=0$ the multidimensional problem is reduced to the one-dimensional problem for the Gegenbauer weight, otherwise not.