Co-Isometry

Let be a unital -algebra, then an element is called co-isometry if .

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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Moslehian, Mohammad Sal. "Co-Isometry." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/Co-Isometry.html

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