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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B. Stankovic, D. Nikolic-Despotovic (1972)
Publications de l'Institut Mathématique [Elektronische Ressource]
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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.
D. Przeworska-Rolewicz (1977)
Annales Polonici Mathematici
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Jaroslav Zemánek (2007)
Banach Center Publications
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K. Chandrasekhara Rao (1979)
Matematički Vesnik
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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.
Miroslav Sova (1982)
Časopis pro pěstování matematiky
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M. R. Dostanić (1989)
Matematički Vesnik
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