J. Rooin

activity

20062020

most citedA Characterization of Metric Projection in CAT(0) Spaces

30 citations · 71 across the 9 of their papers we have counts for

collaborators

Showing 2018Show all

2 papers · 1 filter

math.FA2018

Sharp inequalities for the numerical radius of block operator matrices

M. Ghaderi Aghideh, M. S. Moslehian, J. Rooin

In this paper, we present several sharp upper bounds for the numerical radii of the diagonal and off-diagonal parts of the $2 \times 2$ block operator matrix $\begin{bmatrix}A&B\\ C&…

math.FA2018★ 1 cited

Operator revision of a Ky Fan type inequality

Jamal Rooin, Akram Alikhani

Let $H$ be a complex Hilbert space and $A, B \in B (H)$ such that $0 < A, B \leq \frac{1}{2} I$ . Setting $A^{'} := I - A$ and $B^{'} := I - B$ , we prove $$ A'\nabla_λB'-A'!_λ…