Optimal Weyl-type Inequalities for Operators in Banach Spaces

Author： Carl Bernd  

Publisher： Springer Publishing Company

ISSN： 1385-1292

Source： Positivity, Vol.11, Iss.1, 2007-02, pp. : 41-55

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Abstract

Let (sn) be an s-number sequence. We show for each k = 1, 2, . . . and n ≥ k + 1 the inequality between the eigenvalues and s-numbers of a compact operator T in a Banach space. Furthermore, the constant (k + 1)1/2 is optimal for n = k + 1 and k = 1, 2, . . .. This inequality seems to be an appropriate tool for estimating the first single eigenvalues. On the other hand we prove that the Weyl numbers form a minimal multiplicative s-number sequence and by a well-known inequality between eigenvalues and Weyl numbers due to A. Pietsch they are very good quantities for investigating the optimal asymptotic behavior of eigenvalues.

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