A note on eigenvalues of perturbed 2x2 block Hermitian matrices
Guanghui Cheng, Qin Tan, Zhuan-De Wang · Linear and Multilinear Algebra · 2014
Letbe two Hermitian matrices. We propose new perturbation bounds on the differences between the eigenvalues of and by the bounds of the eigenvector components. These results extend those of Nakatsukasa.