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• W2915217981 abstract "We study similarity classes of commuting row contractions annihilated by what we call higher order vanishing ideals of interpolating sequences. Our main result exhibits a Jordan-type direct sum decomposition for these row contractions. We illustrate how the family of ideals to which our theorem applies is very rich, especially in several variables. We also give two applications of the main result. First, we obtain a purely operator theoretic characterization of interpolating sequences. Second, we classify certain classes of cyclic commuting row contractions up to quasi-similarity in terms of their annihilating ideals. This refines some of our recent work on the topic. We show how this classification is sharp: in general quasi-similarity cannot be improved to similarity. The obstruction to doing so is the existence, or lack thereof, of norm-controlled similarities between commuting tuples of nilpotent matrices, and we investigate this question in detail." @default.
• W2915217981 created "2019-03-02" @default.
• W2915217981 creator A5054796335 @default.
• W2915217981 creator A5076928711 @default.
• W2915217981 date "2019-02-18" @default.
• W2915217981 modified "2023-09-26" @default.
• W2915217981 title "Row contractions annihilated by interpolating vanishing ideals" @default.
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