Every composition operator Cφ on the Lipschitz space Lip0(X) attains its norm. This fact is essentially known and we give in this paper a sequential characterization of the extremal functions for the ...
Journal of Operator Theory, Vol. 56, No. 1 (Summer 2006), pp. 3-15 (13 pages) We propose some norm estimations for sums of positive operators on Hilbert spaces, extending the ones given by ...
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