On (n,k)-quasi class Q^∗ operators Page 1 Journal of Mathematical Inequalities Volume 15,
Number 3 (2021), 1003–1018 doi:10.7153/jmi-2021-15-68 ON (n,k)–QUASI CLASS Q∗ …

In this paper, we are interested in the continuity of the spectrum and some of its parts in the
setting of Hilbert spaces. We study the continuity of the spectrum in the class of operators …

Abstract An operator $ T {\in} L (H) $, is said to belong to k-quasi class $ A_n^* $ operator if
$$ T^{* k}({\mid} T^{n+ 1}{\mid}^{\frac {2}{n+ 1}}-{\mid} T^*{\mid}^ 2) T^ k {\geq} O $$ for some …

First, we see if T is absolute-∗-k-paranormal for k≥ 1, then T is a normaloid operator. We
also see some properties of absolute-∗-k-paranormal operator and∗-A (k) operator. Then …

DISERTACION Për marrjen e gradës shkencore DOKTOR Fusha e studimit: ANALIZË
FUNKSIONALE Lëmia: TEORIA E OPERATORËVE TEOREMA Page 1 REPUBLIKA E …

El análisis funcional es una rama del análisis matemático que permite abordar problemas
de esta área de forma más general por medio del estudio de espacios de funciones y …