Some classes of operators related to $(\lowercase{m},\lowercase{n})$-paranormal and $(\lowercase{m},\lowercase{n})^*$-paranormal operators
Some classes of operators related to $(\lowercase{m},\lowercase{n})$-paranormal and $(\lowercase{m},\lowercase{n})^*$-paranormal operators
Shine Lal Enose(University College, Thiruvananthapuram); Ramya Perumal(N.S.S College, Nemmara); Prasad Thankarajan(University of Calicut, Malapuram)
38권 4호, 1075~1090쪽
초록
In this paper, we study new classes of operators $k$-quasi $(\lowercase{m},\lowercase{n})$-paranormal operator, $k$-quasi $(\lowercase{m},\lowercase{n})^*$-paranormal operator, $k$-qu\-asi $(\lowercase{m},\lowercase{n})$-class~ $\mathcal{Q}$ operator and $k$-quasi $(\lowercase{m},\lowercase{n})$-class~ $\mathcal{Q^{*}}$ operator which are the generalization of $(\lowercase{m},\lowercase{n})$-paranormal and $(\lowercase{m},\lowercase{n})^*$-paranormal operators. We give matrix characterizations for $k$-quasi $(\lowercase{m},\lowercase{n})$-paranormal and $k$-quasi $(\lowercase{m},\lowercase{n})^*$-paranormal operators. Also we study some properties of $k$-quasi $(\lowercase{m},\lowercase{n})$-class~ $\mathcal{Q}$ operator and $k$-quasi $(\lowercase{m},\lowercase{n})$-class~ $\mathcal{Q}^*$ operators. Moreover, these classes of composition operators on $L^2$ spaces are characterized.
Abstract
In this paper, we study new classes of operators $k$-quasi $(\lowercase{m},\lowercase{n})$-paranormal operator, $k$-quasi $(\lowercase{m},\lowercase{n})^*$-paranormal operator, $k$-qu\-asi $(\lowercase{m},\lowercase{n})$-class~ $\mathcal{Q}$ operator and $k$-quasi $(\lowercase{m},\lowercase{n})$-class~ $\mathcal{Q^{*}}$ operator which are the generalization of $(\lowercase{m},\lowercase{n})$-paranormal and $(\lowercase{m},\lowercase{n})^*$-paranormal operators. We give matrix characterizations for $k$-quasi $(\lowercase{m},\lowercase{n})$-paranormal and $k$-quasi $(\lowercase{m},\lowercase{n})^*$-paranormal operators. Also we study some properties of $k$-quasi $(\lowercase{m},\lowercase{n})$-class~ $\mathcal{Q}$ operator and $k$-quasi $(\lowercase{m},\lowercase{n})$-class~ $\mathcal{Q}^*$ operators. Moreover, these classes of composition operators on $L^2$ spaces are characterized.
- 발행기관:
- 대한수학회
- 분류:
- 수학