On differential operators with integral conditions.
Galakhov, E. (1997)
Memoirs on Differential Equations and Mathematical Physics
Similarity:
Galakhov, E. (1997)
Memoirs on Differential Equations and Mathematical Physics
Similarity:
Ryotaro Sato (1976)
Colloquium Mathematicae
Similarity:
Ryotaro Sato (1976)
Colloquium Mathematicae
Similarity:
Beatriz Margolis (1972)
Annales Polonici Mathematici
Similarity:
Zenon J. Jabłoński, Il Bong Jung, Jan Stochel (2006)
Studia Mathematica
Similarity:
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.
Abdelkader Benali, Mohammed Hichem Mortad (2014)
Bulletin of the Polish Academy of Sciences. Mathematics
Similarity:
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.
S. Petrović (1988)
Matematički Vesnik
Similarity:
D. Przeworska-Rolewicz (1977)
Annales Polonici Mathematici
Similarity:
S.C. Arora, Ramesh Kumar (1981)
Publications de l'Institut Mathématique
Similarity:
Jaroslav Zemánek (2007)
Banach Center Publications
Similarity:
Sameer Chavan (2008)
Studia Mathematica
Similarity:
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.
K. Chandrasekhara Rao (1979)
Matematički Vesnik
Similarity:
Fernando Cobos, Luz M. Fernández-Cabrera, Antón Martínez (2005)
Studia Mathematica
Similarity:
The paper establishes necessary and sufficient conditions for compactness of operators acting between general K-spaces, general J-spaces and operators acting from a J-space into a K-space. Applications to interpolation of compact operators are also given.
B. Stankovic, D. Nikolic-Despotovic (1972)
Publications de l'Institut Mathématique [Elektronische Ressource]
Similarity:
John B. Conway, Gabriel Prǎjiturǎ (2005)
Studia Mathematica
Similarity:
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.