Results 11 to 20 of about 5,183 (263)
A complete set of Lorentz-invariant wave packets and modified uncertainty relation
European Physical Journal C: Particles and Fields, 2021 We define a set of fully Lorentz-invariant wave packets and show that it spans the corresponding one-particle Hilbert subspace, and hence the whole Fock space as well, with a manifestly Lorentz-invariant completeness relation (resolution of identity ...
Kin-ya Oda, Juntaro Wada
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Invariant Lagrangian subspaces [PDF]
Proceedings of the American Mathematical Society, 1988 It is proved that on Hilbert spaces with strong symplectic form, every symplectic operator I + C I +
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On Invariant Graph Subspaces [PDF]
Integral Equations and Operator Theory, 2016 In this paper we discuss the problem of decomposition for unbounded $2\times 2$ operator matrices by a pair of complementary invariant graph subspaces. Under mild additional assumptions, we show that such a pair of subspaces decomposes the operator matrix if and only if its domain is invariant for the angular operators associated with the graphs.
Makarov, Konstantin A. +2 more
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Uniformly invariant normed spaces
Bibechana, 2013 In this work, we introduce the concepts of compactly invariant and uniformly invariant. Also we define sometimes C-invariant closed subspaces and then prove every m-dimensional normed space with m > 1 has a nontrivial sometimes C-invariant closed ...
AM Forouzanfar +2 more
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Reconstruction in time-warped weighted shift-invariant spaces with application to spline subspaces
International Journal of Mathematics and Mathematical Sciences, 2003 We discuss the reproducing kernel structure in shift-invariant spaces and the weighted shift-invariant spaces, and obtain the reconstruction formula in time-warped weighted shift-invariant spaces, then apply them to a spline subspace.
Jun Xian, Yongjin Li
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An invariant subspace problem for multilinear operators on Banach spaces and algebras
Journal of Inequalities and Applications, 2016 This paper is concerned with the study of invariant subspace problems for nonlinear operators on Banach spaces/algebras. Our study reveals that one faces unprecedented challenges such as lack of vector space structure and unbounded spectral sets when ...
John Emenyu
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Invariant subspaces in the polydisk [PDF]
Pacific Journal of Mathematics, 1986 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Agrawal, O. P. +2 more
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Adaptive interference suppression based on an invariant subspace of matrices matching for a horizontal array in underwater acoustics [PDF]
JASA Express LettersPassive detection of target-of-interest (TOI) within strong interferences poses a challenge. This paper introduces an adaptive interference suppression based on an invariant subspace of matrix matching. Assume that the TOI-bearing intervals are known. We
Xueli Sheng +4 more
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Invariant Subspaces and Perturbations [PDF]
Proceedings of the American Mathematical Society, 1992 We study the stability of proper closed invariant subspaces with respect to perturbations in norm of continuous operators on a Hubert space, using a nonlinear C
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International Journal of Mathematics and Mathematical Sciences, 2003 We introduce the concept of quasireducible operators. Basic properties and illustrative examples are considered in some detail in order to situate the class of quasireducible operators in its due place.
C. S. Kubrusly
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