Abstract

[1] R. CURTO, Fredholm and invertible n -tuples of operators, Trans. Amer. Math. Soc. 266 (1981), 129– 159. [2] R. CURTO AND K. YAN, The Taylor spectrum of infinite direct sums, Contemp. Math. 120 (1991), 19–27. [3] M. CHŌ AND M. TAKAGUCHI, Joint spectra of matrices, Sci. Rep. Hirosaki Univ. 26 (1979), 15–19. [4] J. PUSHPA AND S. M. PATEL, On joint spectrum, joint numerical range and joint spectral radius, Glasnik Mat. Ser. III 13 (1977), 315–321. [5] J. L. TAYLOR, A joint spectrum for several commuting operators, J. Funct. Anal. 6 (1970), 172–191. [6] J. L. TAYLOR, The analytic functional calculus for several commuting operators, Acta Math. 125 (1970), 1–38.

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