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首页> 外文期刊>Acta Applicandae Mathematicae >Sobolev Spaces with Respect to Measures in Curves and Zeros of Sobolev Orthogonal Polynomials
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Sobolev Spaces with Respect to Measures in Curves and Zeros of Sobolev Orthogonal Polynomials

机译:Sobolev空间关于Sobolev正交多项式的曲线和零点的度量

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In this paper we obtain some practical criteria to bound the multiplication operator in Sobolev spaces with respect to measures in curves. As a consequence of these results, we characterize the weighted Sobolev spaces with bounded multiplication operator, for a large class of weights. To have bounded multiplication operator has important consequences in Approximation Theory: it implies the uniform bound of the zeros of the corresponding Sobolev orthogonal polynomials, and this fact allows to obtain the asymptotic behavior of Sobolev orthogonal polynomials. We also obtain some non-trivial results about these Sobolev spaces with respect to measures; in particular, we prove a main result in the theory: they are Banach spaces.
机译:在本文中,我们获得了一些实用的准则来约束Sobolev空间中的乘法算子,并将其限制在曲线上。这些结果的结果是,对于一类较大的权重,我们使用有界乘法运算符来表征加权的Sobolev空间。有界乘法算子在近似理论中具有重要意义:它暗示了相应的Sobolev正交多项式的零的统一界,并且这一事实允许获得Sobolev正交多项式的渐近性质。我们还获得了关于这些Sobolev空间的一些非平凡的结果。特别是,我们证明了该理论的主要结果:它们是Banach空间。

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