Spectral Radius, Numerical Range

Mohammed Hichem Mortad
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Mohammed Hichem Mortad: University of Oran 1

Chapter Chapter 9 in Counterexamples in Operator Theory, 2022, pp 145-157 from Springer

Abstract: Abstract Let A be in B(H). The spectral radius of A is defined as r ( A ) = sup { | λ | : λ ∈ σ ( A ) } . $$\displaystyle r(A)=\sup \{|\lambda |:~\lambda \in \sigma (A)\}. $$

Date: 2022
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DOI: 10.1007/978-3-030-97814-3_9

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