Multiplication of conjugacy classes, colligations, and characteristic functions of matrix argumentстатья
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Дата последнего поиска статьи во внешних источниках: 17 июля 2019 г.
Аннотация:We extend the classical construction of operator colligations and characteristic functions. Consider the group $G$ of finitary block unitary matrices of order $\alpha+\infty+···+\infty$ ($m$ times) and its subgroup $K\simeq U(\infty)$, which consists of block diagonal unitary matrices with the identity block of order α and a matrix $u \in U(\infty)$ repeated m times. It turns out that there is a natural multiplication on the space $G//K$ of conjugacy classes. We construct “spectral data” of conjugacy classes, which visualize the multiplication and are sufficient for reconstructing a conjugacy class.