Results 61 to 70 of about 1,463 (129)
Joint numerical ranges: recent advances and applications minicourse by V. Müller and Yu. Tomilov
Concrete Operators, 2020 We present a survey of some recent results concerning joint numerical ranges of n-tuples of Hilbert space operators, accompanied with several new observations and remarks.
Müller V., Tomilov Yu.
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On the generalized Kato spectrum [PDF]
, 2011 2010 Mathematics Subject Classification: 47A10.We show that the symmetric difference between the generalized Kato spectrum and the essential spectrum defined in [7] by sec(T) = {l О C ; R(lI-T) is not closed } is at most countable and we also give some
Benharrat, Mohammed, Messirdi, Bekkai
core
Generic stability of the spectra for bounded linear operators on Banach spaces
International Journal of Stochastic Analysis, Volume 12, Issue 1, Page 31-33, 1999., 1998 In this paper, we study the stability of the spectra of bounded linear operators B(X) in a Banach space X, and obtain that their spectra are stable on a dense residual subset of B(X).
Luo Qun
wiley +1 more source
Nonlocal heat equations with generalized fractional Laplacian
Advances in Nonlinear AnalysisWe study heat equations with generalized fractional Laplacian, which is defined by the spectral theory. Here we develop the existence theory for those equations. Also, we present some numerical simulations for our problems.
Kossowski Igor, Przeradzki Bogdan
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On the continuity of spectra for families of magnetic pseudodifferential operators
, 2010 For families of magnetic pseudodifferential operators defined by symbols and magnetic fields depending continuously on a real parameter $\epsilon$, we show that the corresponding family of spectra also varies continuously with $\epsilon$.Comment: 22 ...
Blanchard E. +5 more
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On the completely indeterminate case for block Jacobi matrices
Concrete Operators, 2017 We consider the infinite Jacobi block matrices in the completely indeterminate case, i. e. such that the deficiency indices of the corresponding Jacobi operators are maximal.
Osipov Andrey
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, 2017 In this work, we establish a formula for the second regularized trace of a second order differential operator with unbounded operator coefficient given in a finite interval. Mathematics subject classification (2010): 47A10, 34L20, 34B05, 34B09.
Özlem Baksi +2 more
semanticscholar +1 more source
On a class of $h$-Fourier integral operators
, 2013 In this paper, we study the $L^{2}$-boundedness and $L^{2}$-compactness of a class of $h$-Fourier integral operators. These operators are bounded (respectively compact) if the weight of the amplitude is bounded (respectively tends to $0)$
Abderrahmane, Senoussaoui +1 more
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Peripheral local spectrum preservers and maps increasing the local spectral radius
, 2016 We address two long standing problems in the context of local spectral radius preservers. First, we completely describe the form of maps preserving the peripheral local spectrum of product or triple product of operators.
A. Bourhim, Tarik Jari, J. Mashreghi
semanticscholar +1 more source
On unbounded commuting Jacobi operators and some related issues
Concrete Operators, 2019 We consider the situations, when two unbounded operators generated by infinite Jacobi matrices, are self-adjoint and commute. It is found that if two Jacobi matrices formally commute, then two corresponding operators are either self-adjoint and commute ...
Osipov Andrey
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