jaundiced
发表于 2025-3-27 01:02:44
Finite Rank Perturbations in Pontryagin Spaces and a Sturm–Liouville Problem with ,-rational Boundarensions of the spectral subspaces corresponding to open intervals in gaps of the essential spectrum differ at most by .+2.. This is a natural extension of a classical result on finite rank perturbations of selfadjoint operators in Hilbert spaces to the indefinite setting.With the help of an explicit
GREG
发表于 2025-3-27 04:02:20
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Lipoprotein
发表于 2025-3-27 08:01:59
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progestin
发表于 2025-3-27 10:52:38
Rational , Carathéodory Functions and Central Non-negative Hermitian Measuresasures are intimately connected to central . Carathéodory functions. This enables us to prove an explicit representation of the nonstochastic spectral measure of an arbitrary multivariate autoregressive stationary sequence in terms of the covariance sequence.
Density
发表于 2025-3-27 14:21:32
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Ardent
发表于 2025-3-27 19:50:38
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Urea508
发表于 2025-3-28 01:42:08
An Addendum to a Paper by Li and Zhangositive semidefinite matrices. Slightly generalizing Li and Zhang’s proof we obtain a more general result under the assumption that all matrices on the principal diagonal are of the same size. Also, we answer a question asked by Marcus and Watkins in 1971.
musicologist
发表于 2025-3-28 03:39:01
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充足
发表于 2025-3-28 08:00:36
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使尴尬
发表于 2025-3-28 14:16:55
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