Let be a -algebra, then an element is called a partial isometry if .
Partial Isometry Element
This entry contributed by Mohammad Sal Moslehian
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References
Murphy, G. J. -Algebras and Operator Theory. New York: Academic Press, 1990.Referenced on Wolfram|Alpha
Partial Isometry ElementCite this as:
Moslehian, Mohammad Sal. "Partial Isometry Element." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/PartialIsometryElement.html