On differential operators with integral conditions.
Galakhov, E. (1997)
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Galakhov, E. (1997)
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Ryotaro Sato (1976)
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Ryotaro Sato (1976)
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Beatriz Margolis (1972)
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S.C. Arora, Ramesh Kumar (1981)
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K. Chandrasekhara Rao (1979)
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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.
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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.
D. Przeworska-Rolewicz (1977)
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M. Budimčević, B. Stanković (1971)
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M. R. Dostanić (1989)
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