On differential operators with integral conditions.
Galakhov, E. (1997)
Memoirs on Differential Equations and Mathematical Physics
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Galakhov, E. (1997)
Memoirs on Differential Equations and Mathematical Physics
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Ryotaro Sato (1976)
Colloquium Mathematicae
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Ryotaro Sato (1976)
Colloquium Mathematicae
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Beatriz Margolis (1972)
Annales Polonici Mathematici
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S.C. Arora, Ramesh Kumar (1981)
Publications de l'Institut Mathématique
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D. Przeworska-Rolewicz (1977)
Annales Polonici Mathematici
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Abdelkader Benali, Mohammed Hichem Mortad (2014)
Bulletin of the Polish Academy of Sciences. Mathematics
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We are mainly concerned with the result of Kaplansky on the composition of two normal operators in the case in which at least one of the operators is unbounded.
John B. Conway, Gabriel Prǎjiturǎ (2005)
Studia Mathematica
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For a scalar λ, two operators T and S are said to λ-commute if TS = λST. In this note we explore the pervasiveness of the operators that λ-commute with a compact operator by characterizing the closure and the interior of the set of operators with this property.
B. Stankovic, D. Nikolic-Despotovic (1972)
Publications de l'Institut Mathématique [Elektronische Ressource]
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K. Chandrasekhara Rao (1979)
Matematički Vesnik
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Jaroslav Zemánek (2007)
Banach Center Publications
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M. R. Dostanić (1989)
Matematički Vesnik
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Zenon J. Jabłoński, Il Bong Jung, Jan Stochel (2006)
Studia Mathematica
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The concept of k-step full backward extension for subnormal operators is adapted to the context of completely hyperexpansive operators. The question of existence of k-step full backward extension is solved within this class of operators with the help of an operator version of the Levy-Khinchin formula. Some new phenomena in comparison with subnormal operators are found and related classes of operators are discussed as well.