A classification of H-closed extensions
A. Błaszczyk, U. Lorek (1978)
Colloquium Mathematicae
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A. Błaszczyk, U. Lorek (1978)
Colloquium Mathematicae
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Paweł Szeptycki (1975)
Studia Mathematica
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Upke-Walther Schmincke (1972)
Mathematische Zeitschrift
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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.
Pawel Szeptycki, Iwo Labuda (1988)
Mathematische Annalen
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T. K. Pal, M. Maiti, J. Achari (1976)
Matematički Vesnik
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D. W. Hajek (1986)
Matematički Vesnik
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H. A. Antosiewicz, A. Cellina (1977)
Annales Polonici Mathematici
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Aarts J. M. (1971)
Colloquium Mathematicum
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C. Benhida, E. H. Zerouali (2009)
Studia Mathematica
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Let R and S be two operators on a Hilbert space. We discuss the link between the subscalarity of RS and SR. As an application, we show that backward Aluthge iterates of hyponormal operators and p-quasihyponormal operators are subscalar.
Konrad Schmüdgen (1981)
Mathematische Annalen
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M. R. Koushesh
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Let X be a space. A space Y is called an extension of X if Y contains X as a dense subspace. For an extension Y of X the subspace Y∖X of Y is called the remainder of Y. Two extensions of X are said to be equivalent if there is a homeomorphism between them which fixes X pointwise. For two (equivalence classes of) extensions Y and Y' of X let Y ≤ Y' if there is a continuous mapping of Y' into Y which fixes X pointwise. Let 𝓟 be a topological property. An extension Y of X is called a 𝓟-extension...
Rainer Wüst (1975)
Mathematische Zeitschrift
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