English

Nikolskii inequality for lacunary spherical polynomials

Classical Analysis and ODEs 2019-05-02 v1

Abstract

We prove that for d2d\ge 2, the asymptotic order of the usual Nikolskii inequality on Sd\mathbb{S}^d (also known as the reverse H\"{o}lder's inequality) can be significantly improved in many cases, for lacunary spherical polynomials of the form f=j=0mfnjf=\sum_{j=0}^m f_{n_j} with fnjf_{n_j} being a spherical harmonic of degree njn_j and nj+1nj3n_{j+1}-n_j\ge 3. As is well known, for d=1d=1, the Nikolskii inequality for trigonometric polynomials on the unit circle does not have such a phenomenon.

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Cite

@article{arxiv.1905.00323,
  title  = {Nikolskii inequality for lacunary spherical polynomials},
  author = {Feng Dai and Dmitry Gorbachev and Sergey Tikhonov},
  journal= {arXiv preprint arXiv:1905.00323},
  year   = {2019}
}

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6 pages