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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Jaroslav Zemánek (2007)
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Miroslav Sova (1982)
Časopis pro pěstování matematiky
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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.
Toka Diagana (2003)
Rendiconti del Seminario Matematico della Università di Padova
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Sameer Chavan (2008)
Studia Mathematica
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We introduce and discuss a class of operators, to be referred to as operators close to isometries. The Bergman-type operators, 2-hyperexpansions, expansive p-isometries, and certain alternating hyperexpansions are main examples of such operators. We establish a few decomposition theorems for operators close to isometries. Applications are given to the theory of p-isometries and of hyperexpansive operators.
M. R. Dostanić (1989)
Matematički Vesnik
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