On the essential spectra of some matrix of linear relations
Teresa Álvarez, Aymen Ammar, Aref Jeribi · Mathematical Methods in the Applied Sciences · 2013
In this paper, we investigate a detailed treatment of some subsets of essential spectra of a closed multivalued linear operator. On the following, we will establish some results on perturbation theory of 2 × 2 matrix of multivalued linear operators. Copyright © 2013 John Wiley & Sons, Ltd.