2007 | OriginalPaper | Chapter
Essential Spectrum
Published in: Spectral Theory of Linear Operators
Publisher: Birkhäuser Basel
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In this chapter we study various types of essential spectra of operators on a Banach space
X
. They are closely connected with the Calkin algebra
$$ \mathcal{B}\left( X \right)/\mathcal{K}\left( X \right) $$
, where
$$ \mathcal{K}\left( X \right) $$
denotes the ideal of compact operators.