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Essentially Unitary

A bounded operator U on a Hilbert space H is called essentially unitary if U^*U-I and UU^*-I are compact operators.

This entry contributed by Mohammad Sal Moslehian

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References

Murphy, G. J. C*-Algebras and Operator Theory. New York: Academic Press, 1990.

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Essentially Unitary

Cite this as:

Weisstein, Eric W., with contributions by Mohammad Sal Moslehian. "Essentially Unitary." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/EssentiallyUnitary.html

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