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arXiv 2005.07556math.FA
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行球上有效的非交换Nevanlinna-Pick插值及其应用

Effective noncommutative Nevanlinna-Pick interpolation in the row ball, and applications

Meric Augat, Michael T. Jury, James Eldred Pascoe

摘要:

我们提供了一个有效的单矩阵的标准,我们称之为初等Pick矩阵,为非交换Nevanlinna-Pick插值问题的行球的可解性,并提供了一些应用。特别是,我们证明了所谓的“列-行属性”失败的自由半群代数,在形成鲜明对比的类似交换的情况下。初等Pick矩阵的其他应用包括矩阵行压缩的局部扩张定理和非交换设置中的插值序列。最后,我们提出了一些数值结果有关的列-行属性的失败。

英文摘要:

We provide an effective single-matrix criterion, in terms of what we call the elementary Pick matrix, for the solvability of the noncommutative Nevanlinna-Pick interpolation problem in the row ball, and provide some applications. In particular we show that the so-called "column-row property" fails for the free semigroup algebras, in stark contrast to the analogous commutative case. Additional applications of the elementary Pick matrix include a local dilation theorem for matrix row contractions and interpolating sequences in the noncommutative setting. Finally we present some numerical results related to the failure of the column-row property.

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