Almost regular operators are regular.
Teresa Bermúdez, Manuel González (1999)
Extracta Mathematicae
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Teresa Bermúdez, Manuel González (1999)
Extracta Mathematicae
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Schmoeger, Christoph (1997)
Portugaliae Mathematica
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Diana Caponetti, Valeria Marraffa (1999)
Mathematica Bohemica
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A descriptive characterization of a Riemann type integral, defined by BV partition of unity, is given and the result is used to prove a version of the controlled convergence theorem.
Kamil John (1995)
Czechoslovak Mathematical Journal
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Tetiana Ivashyna (2013)
Open Mathematics
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Let X and Y be Banach spaces. An operator G: X → Y is a Daugavet center if ‖G +T‖ = ‖G‖+‖T‖ for every rank-1 operator T. For every Daugavet center G we consider a certain set of operators acting from X, so-called G-narrow operators. We prove that if J is the natural embedding of Y into a Banach space E, then E can be equivalently renormed so that an operator T is (J ○ G)-narrow if and only if T is G-narrow. We study G-rich subspaces of X: Z ⊂ X is called G-rich if the quotient map q:...