ℱ-singular and G-cosingular operators
Joe Howard (1970)
Colloquium Mathematicae
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Joe Howard (1970)
Colloquium Mathematicae
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Karl Gustafson (1982)
Banach Center Publications
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J. C. Merlo (1967)
Annales Polonici Mathematici
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C. Read (1999)
Studia Mathematica
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Properties of strictly singular operators have recently become of topical interest because the work of Gowers and Maurey in [GM1] and [GM2] gives (among many other brilliant and surprising results, such as those in [G1] and [G2]) Banach spaces on which every continuous operator is of form λ I + S, where S is strictly singular. So if strictly singular operators had invariant subspaces, such spaces would have the property that all operators on them had invariant subspaces. However, in...
J. Janas (1994)
Studia Mathematica
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The paper deals mostly with spectral properties of unbounded hyponormal operators. Some nontrivial examples of such operators are given.
Takashi Ichinose (1982)
Banach Center Publications
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Sucu, Sezgin, Done, Yesim, Ibikli, Ertan (2014)
Mathematica Balkanica New Series
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MSC 2010: 41A25, 41A35
Houshang H. Sohrab (1983)
Manuscripta mathematica
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Adžić, Nevenka (1998)
Novi Sad Journal of Mathematics
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Kevin Clancey, Israel Gohberg (1979)
Mathematische Zeitschrift
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