Norm of a derivation and hyponormal operators.
Mohamed Barraa, Mohamed Boumazgour (2001)
Extracta Mathematicae
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Mohamed Barraa, Mohamed Boumazgour (2001)
Extracta Mathematicae
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Khabirov, S.V. (2002)
Sibirskij Matematicheskij Zhurnal
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Song Li (1996)
Colloquium Mathematicae
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Chilin, Vladimir, Litvinov, Semyon (2006)
SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
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Kokilashvili, V., Meskhi, A. (2001)
Georgian Mathematical Journal
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Robert Mařík (2005)
Archivum Mathematicum
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In the paper the discrete version of the Morse’s singularity condition is established. This condition ensures that the discrete functional over the unbounded interval is positive semidefinite on the class of the admissible functions. Two types of admissibility are considered.
Yu. Farforovskaya (1994)
Banach Center Publications
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This paper shows some directions of perturbation theory for Lipschitz functions of selfadjoint and normal operators, without giving precise proofs. Some of the ideas discussed are explained informally or for the finite-dimensional case. Several unsolved problems are mentioned.
Kiguradze, I., Půža, B., Stavroulakis, I.P. (2001)
Georgian Mathematical Journal
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Hatem Mejjaoli (2012)
Annales mathématiques Blaise Pascal
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We introduce and study the linear symmetric systems associated with the modified Cherednik operators. We prove the well-posedness results for the Cauchy problem for these systems. Eventually we describe the finite propagation speed property of it.
Nikolova, L., Zachariades, T. (2010)
Banach Journal of Mathematical Analysis [electronic only]
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