Partial Isometry Element
Let A be a C^*-algebra, then an element u in A is called a partial isometry if uu^*u=u.
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.Referenced on Wolfram|Alpha
Partial Isometry ElementCite this as:
Moslehian, Mohammad Sal. "Partial Isometry Element." From MathWorld--A Wolfram Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/PartialIsometryElement.html