Geodesic
On Quasi-Normality of Two-Sided Multiplication
Serdica Mathematical Journal, Tome 35 (2009) no. 2, pp. 117-128

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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.
Keywords: Bi-Multiplication, Quasi-Normalité, Spectraloide 
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     author = {Amouch, M.},
     title = {On {Quasi-Normality} of {Two-Sided} {Multiplication}},
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Amouch, M. On Quasi-Normality of Two-Sided Multiplication. Serdica Mathematical Journal, Tome 35 (2009) no. 2, pp. 117-128. http://geodesic.mathdoc.fr/item/SMJ2_2009_35_2_a0/