Singular value, positive semidefinite matrix, block matrix, unitarily invariant norm, inequality
This paper aims to give singular value and norm inequalities associated with $2\times 2$ positive semidefinite block matrices.
Burqan, Aliaa and Kittaneh, Fuad.
"Singular Value and Norm Inequalities Associated with 2 x 2 Positive Semidefinite Block Matrices",
Electronic Journal of Linear Algebra,
Volume 32, pp. 116-124.