A property of quasi-complements
Robert H. Lohman (1974)
Colloquium Mathematicae
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Robert H. Lohman (1974)
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Roman Sikorski (1974)
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Olivier Olela Otafudu, Zechariah Mushaandja (2017)
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We show that the image of a q-hyperconvex quasi-metric space under a retraction is q-hyperconvex. Furthermore, we establish that quasi-tightness and quasi-essentiality of an extension of a T0-quasi-metric space are equivalent.
Pablo F. Meilán, Mariano Creus, Mario Garavaglia (2000)
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S. K. Ghosal, M. Chatterjee (1974)
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Tomasz Natkaniec (1992)
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Bent Fuglede (1965-1966)
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Amouch, M. (2009)
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2000 Mathematics Subject Classification: 47B47, 47B10, 47A30. In this note, we characterize quasi-normality of two-sided multiplication, restricted to a norm ideal and we extend this result, to an important class which contains all quasi-normal operators. Also we give some applications of this result.