The annulus as a K-spectral set

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November 2012, 11(6): 2291-2303. doi: 10.3934/cpaa.2012.11.2291

The annulus as a K-spectral set

1.	Institut de Recherche Mathématique de Rennes, UMR no. 6625, Université de Rennes 1, Campus de Beaulieu, 35042 RENNES Cedex

Received March 2010 Revised March 2010 Published April 2012

Abstract
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We consider the annulus $\mathcal{A}_R$ of complex numbers with modulus and inverse of modulus bounded by $R>1$. We present some situations, in which this annulus is a K-spectral set for an operator $A$, and some related estimates.

Keywords: numerical radius, spectral set, Numerical range.

Mathematics Subject Classification: Primary: 47A11; Secondary: 47A25.

Citation: Michel Crouzeix. The annulus as a K-spectral set. Communications on Pure & Applied Analysis, 2012, 11 (6) : 2291-2303. doi: 10.3934/cpaa.2012.11.2291

References:

[1]	K. Okubo and T. Ando, Constants related to operators of class $C_\rho$,, Manuscripta Math., 16 (1975), 385. doi: 10.1007/BF01323467. Google Scholar
[2]	C. Badea, B. Beckermann and M. Crouzeix, Intersections of several disks of the Riemann sphere as $K$-spectral sets,, Com. Pure Appl. Anal., 8 (2009), 37. Google Scholar
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[5]	J. von Neumann, Eine Spektraltheorie für allgemeine Operatoren eines unitären Raumes,, Math. Nachr., 4 (1951), 258. Google Scholar
[6]	V. I. Paulsen, Toward a theory of $K$-spectral sets,, in, (1988), 221. Google Scholar
[7]	V. I. Paulsen, "Completely Bounded Maps and Operator Algebras,'', Cambridge Studies in Advanced Mathematics, (2002). Google Scholar
[8]	V. I. Paulsen and D. Singh, Extensions of Bohr's inequality,, Bull. London Math. Soc., 38 (2006), 991. doi: 10.1112/S0024609306019084. Google Scholar
[9]	A. L. Shields, Weighted shift operators and analytic function theory,, in, (1974), 49. Google Scholar
[10]	J. G. Stampfli, Minimal range theorems for operators with thin spectra,, Pacific Journal of Math., 23 (1967), 601. Google Scholar

show all references

References:

[1]	K. Okubo and T. Ando, Constants related to operators of class $C_\rho$,, Manuscripta Math., 16 (1975), 385. doi: 10.1007/BF01323467. Google Scholar
[2]	C. Badea, B. Beckermann and M. Crouzeix, Intersections of several disks of the Riemann sphere as $K$-spectral sets,, Com. Pure Appl. Anal., 8 (2009), 37. Google Scholar
[3]	W. F. Donoghue, On a problem of Nieminen,, Inst. Hautes Etudes Sci. Publ. Math., 16 (1963), 31. doi: 10.1007/BF02684290. Google Scholar
[4]	R. G. Douglas and V. I. Paulsen, Completely bounded maps and hypo-Dirichlet algebras,, Acta Sci. Math. (Szeged), 50 (1986), 143. Google Scholar
[5]	J. von Neumann, Eine Spektraltheorie für allgemeine Operatoren eines unitären Raumes,, Math. Nachr., 4 (1951), 258. Google Scholar
[6]	V. I. Paulsen, Toward a theory of $K$-spectral sets,, in, (1988), 221. Google Scholar
[7]	V. I. Paulsen, "Completely Bounded Maps and Operator Algebras,'', Cambridge Studies in Advanced Mathematics, (2002). Google Scholar
[8]	V. I. Paulsen and D. Singh, Extensions of Bohr's inequality,, Bull. London Math. Soc., 38 (2006), 991. doi: 10.1112/S0024609306019084. Google Scholar
[9]	A. L. Shields, Weighted shift operators and analytic function theory,, in, (1974), 49. Google Scholar
[10]	J. G. Stampfli, Minimal range theorems for operators with thin spectra,, Pacific Journal of Math., 23 (1967), 601. Google Scholar

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