## Abstract

Denote by B(o, T) the class of entire functions of exponential type o which are bounded by 1 on the real axis outside (-T, T). It is shown that this class, considered as a subset of C[-T, T], has

approximate dimension 2oT/r in analogy to the Landau-Pollak-Slepian dimension theorem. More generally, the optimal subspaces and corresponding worst functions for the n-widths of B(o, T) are characterized.

Prominently featured is the fact that it is possible to achieve the n-widths via interpolation, provided the sampling points are adroitly chosen. However, the interpolating functions differ from the standard ones.

approximate dimension 2oT/r in analogy to the Landau-Pollak-Slepian dimension theorem. More generally, the optimal subspaces and corresponding worst functions for the n-widths of B(o, T) are characterized.

Prominently featured is the fact that it is possible to achieve the n-widths via interpolation, provided the sampling points are adroitly chosen. However, the interpolating functions differ from the standard ones.

Original language | English GB |
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Pages (from-to) | 803-813 |

Number of pages | 11 |

Journal | SIAM Journal on Mathematical Analysis |

Volume | 16 |

Issue number | 4 |

State | Published - 1985 |