MATEMATIČKI VESNIK
МАТЕМАТИЧКИ ВЕСНИК



MATEMATIČKI VESNIK
$\mathbf{S}$-PSEUDOSPECTRA AND $\mathbf{S}$-ESSENTIAL PSEUDOSPECTRA
A. Ammar, H. Daoud, A. Jeribi

Abstract

In the present paper, we introduce and study the $\mathcal{S}$-pseudospectra and the essential $\mathcal{S}$-pseudospectra of linear relations. We start by giving the definition and we investigate the characterization and some properties of these $\mathcal{S}$-pseudospectra.

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Keywords: Linear relation; $\mathcal{S}$-pseudospectra; $\mathcal{S}$-essential pseudospectra.

MSC: 47A06

Pages:  95--105     

Volume  72 ,  Issue  2 ,  2020