A Korovkin-type theorem in the space of Riemann integrable funciotns.
Michele Campiti (1987)
Collectanea Mathematica
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Michele Campiti (1987)
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S. Borrey (1989)
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Richard Aron (1973)
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Cristina Jordán Lluch, Juan Ramón Torregrosa Sánchez (1987)
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V. Fonf (1993)
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It is proved that a separable normed space contains a closed bounded convex symmetric absorbing supportless subset if and only if this space may be covered (in its completion) by the range of a nonisomorphic operator.
Aref Kamal (1992)
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Jeffrey Vaaler (1981)
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Freire, Nuno C. (1991)
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J. A. López Molina (1986)
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