On A-numerical radius inequalities for $2\times 2$ operator matrices

Nirmal Chandra Rout, Satyajit Sahoo, Debasisha Mishra

Let ($\mathcal{H},⟨.,.⟩)$ be a complex Hilbert space and $A$ be a positive bounded linear operator on it. Let $w_A(T)$ be the $A$-numerical radius and $\Vert T{\Vert }_A$ be…