Spectrum

Mohammed Hichem Mortad
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Mohammed Hichem Mortad: University of Oran 1

Chapter Chapter 8 in Counterexamples in Operator Theory, 2022, pp 121-143 from Springer

Abstract: Abstract Let A ∈ B(H) where H is a complex Hilbert space. The set σ ( A ) = { λ ∈ ℂ : λ I − A is not invertible } $$\displaystyle \sigma (A)=\{\lambda \in \mathbb {C}:~\lambda I-A \text{ is not invertible}\} $$ is called the spectrum of A.

Date: 2022
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DOI: 10.1007/978-3-030-97814-3_8

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