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• W3171995456 abstract "In a recent paper [15], Hilbert space operators $T$ with the property that each sequence of the form ${|T^n h|^2}_{n=0}^{infty}$ is conditionally positive definite in a semigroup sense were introduced. In the present paper, this line of research is continued in depth in the case of unilateral weighted shifts. The conditional positive definiteness of weighted shifts is characterized in terms of formal moment sequences. The description of the representing triplet, the main object canonically associated with such operators, is provided. The backward extension problem for conditionally positive definite weighted shifts is solved, revealing a new feature that does not appear in the case of other operator classes. Finally, the flatness problem in this context is discussed, with an emphases on unexpected differences from the corresponding problem for subnormal weighted shifts." @default.
• W3171995456 created "2021-06-22" @default.
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• W3171995456 date "2021-06-06" @default.
• W3171995456 modified "2023-09-27" @default.
• W3171995456 title "Conditionally positive definite weighted shifts" @default.
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• W3171995456 hasPublicationYear "2021" @default.
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