Centered operators
Bernard Morrel, Paul Muhly (1974)
Studia Mathematica
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Bernard Morrel, Paul Muhly (1974)
Studia Mathematica
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S.V. Ludkovsky (1999)
Annales mathématiques Blaise Pascal
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Czesław Ryll-Nardzewski (1953)
Fundamenta Mathematicae
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V. Mandrekar, M. Nadkarni, D. Patil (1970)
Studia Mathematica
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Paweł Głowacki (1991)
Studia Mathematica
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Singh, R.K., Gupta, D.K., Komal, B.S. (1979)
International Journal of Mathematics and Mathematical Sciences
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I. Hirschman (1972)
Studia Mathematica
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Schôichi Ôta (1995)
Studia Mathematica
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Some results on quasi-affinity for bounded operators are extended to unbounded ones and normal extensions of an unbounded operator are discussed in connection with quasi-affinity.
Jan Niechwiej (1984)
Studia Mathematica
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Marilina Carena, Marisa Toschi (2015)
Colloquium Mathematicae
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Let (X,d,μ) be a space of homogeneous type. We study the relationship between two types of s-sets: relative to a distance and relative to a measure. We find a condition on a closed subset F of X under which F is an s-set relative to the measure μ if and only if F is an s-set relative to δ. Here δ denotes the quasi-distance defined by Macías and Segovia such that (X,δ,μ) is a normal space. In order to prove this result, we prove a covering type lemma and a type of Hausdorff measure based...
Putnam, C.R. (1981)
International Journal of Mathematics and Mathematical Sciences
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