Resumen de Browder essential approximate pseudospectrum and defect pseudospectrum on a Banach space

Aymen Ammar, Aref Jeribi, Kamel Mahfoudhi

• In this paper, we introduce and study the Browder essential approximate pseudospectrum and the Browder essential defect pseudospectrum of bounded linear operators on a Banach space. Moreover, we characterize these spectra and will give some results concerning the stability of them under suitable perturbations.