Arobinda Ghosh

collaborators

2 papers

math.FA2026

On the numerical radius of a class of weighted shift operators

Arobinda Ghosh, Riddhick Birbonshi, Sarita Ojha

In this paper, we derive some bounds on numerical radius of the weighted shift operator $T$ with weights $(1, s q, q^{2}, t q^{3}, q^{4}, s q^{5}, q^{6}, t q^{7}, \dots)$ where $s, t > 0$ and $0 < q < 1$ . Furt…

math.FA2026

Improved Bounds for numerical radius and $a$ -numerical radius in $C^{*}$ -algebras

Saikat Mahapatra, Arobinda Ghosh, Riddhick Birbonshi

In this article, we derive several significant upper bounds for the numerical radius and $a$ -numerical radius of an element in a $C^{*}$ -algebra by improving inequalities for posit…

On the numerical radius of a class of weighted shift operators

Improved Bounds for numerical radius and a-numerical radius in C∗-algebras

Improved Bounds for numerical radius and $a$ -numerical radius in $C^{*}$ -algebras