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Proceedings of the American Mathematical Society

Published by the American Mathematical Society since 1950, Proceedings of the American Mathematical Society is devoted to shorter research articles in all areas of pure and applied mathematics.

ISSN 1088-6826 (online) ISSN 0002-9939 (print)

The 2020 MCQ for Proceedings of the American Mathematical Society is 0.85.

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A property of weakly compact operators on $C[0,1]$
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by James R. Holub PDF
Proc. Amer. Math. Soc. 97 (1986), 396-398 Request permission

Abstract:

It is shown that if $T$ is a bounded linear operator on $C[0,1]$ then either $||I + T||$ or $||I - T||$ equals $1 + ||T||$. If $T$ is a weakly compact operator then $||I + T|| = 1 + ||T||$, an extension of a result of Daugavet concerning compact operators on $C[0,1]$.
References
    V. F. Babenko and S. A. Pichugov, A property of compact operators in the space of integrable functions, Ukranian Math. J. 33 (1981), 374-376.
  • I. K. Daugavet, A property of completely continuous operators in the space $C$, Uspehi Mat. Nauk 18 (1963), no. 5 (113), 157–158 (Russian). MR 0157225
  • Nelson Dunford and Jacob T. Schwartz, Linear operators. Part II: Spectral theory. Self adjoint operators in Hilbert space, Interscience Publishers John Wiley & Sons, New York-London, 1963. With the assistance of William G. Bade and Robert G. Bartle. MR 0188745
  • C. Franchetti and E. W. Cheney, Minimal projections in tensor-product spaces, J. Approx. Theory 41 (1984), no. 4, 367–381. MR 753032, DOI 10.1016/0021-9045(84)90093-5
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Additional Information
  • © Copyright 1986 American Mathematical Society
  • Journal: Proc. Amer. Math. Soc. 97 (1986), 396-398
  • MSC: Primary 47B05; Secondary 47B38
  • DOI: https://doi.org/10.1090/S0002-9939-1986-0840617-6
  • MathSciNet review: 840617