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arXiv 2005.14561math.FA
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单位圆上具有极点的有理矩阵符号的类Toeplitz算子:Fredholm性质

A Toeplitz-like operator with rational matrix symbol having poles on the unit circle: Fredholm properties

G. J. Groenewald, S. ter Horst, J. Jaftha, A. C. M. Ran

摘要:

本文研究了一类无界Toeplitz型算子,该算子由极点在单位圆T上的有理矩阵函数生成。推广了文献[11,12,13]中关于T上极点的纯量有理函数生成的算子的分析。证明了T上具有极点和零点的有理矩阵函数的Wiener-Hopf型分解,并利用该分解分析了此类Toeplitz类算子的Fredholm性质.给出了基于因子分解的指数计算公式。进一步证明了T上无零点的矩阵函数的行列式不足以使类Toeplitz算子成为Fredholm,这与经典的情形相反.

英文摘要:

This paper concerns the analysis of an unbounded Toeplitz-like operator generated by a rational matrix function having poles on the unit circle T. It extends the analysis of such operators generated by scalar rational functions with poles on T found in [11,12,13]. A Wiener-Hopf type factorization of rational matrix functions with poles and zeroes on T is proved and then used to analyze the Fredholm properties of such Toeplitz-like operators. A formula for the index, based on the factorization, is given. Furthermore, it is shown that the determinant of the matrix function having no zeroes on T is not sufficient for the Toeplitz-like operator to be Fredholm, in contrast to the classical case.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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