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Proceedings of the American Mathematical Society
Proceedings of the American Mathematical Society
ISSN 1088-6826(online) ISSN 0002-9939(print)

 

Spectrum of the product of operators


Authors: Milan Hladnik and Matjaž Omladič
Journal: Proc. Amer. Math. Soc. 102 (1988), 300-302
MSC: Primary 47A10,; Secondary 47A12
MathSciNet review: 920990
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Abstract: It is shown that the product of two operators on a Hilbert space has real spectrum if one of them is symmetric and the other is positive. Also, the product of two positive operators has positive spectrum.


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DOI: http://dx.doi.org/10.1090/S0002-9939-1988-0920990-2
PII: S 0002-9939(1988)0920990-2
Article copyright: © Copyright 1988 American Mathematical Society