Journal of Operator Theory

Volume 7, Issue 1, Winter 1982 pp. 61-78.

Contraction semigroups and the spectrum of

$A_1 \otimes I + I \otimes A_2$

Authors: Ira W. Herbst
Author institution:Department of Mathematics, University of Virginia, Charlottesville, Virginia 22903, U.S.A.

Summary:

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