Let be a unital -algebra. An element is called unitary if .
For example, for each self-adjoint element , the element
is unitary, but the converse is not true in general (Kadison and Ringrose 1997).
Let be a unital -algebra. An element is called unitary if .
For example, for each self-adjoint element , the element
is unitary, but the converse is not true in general (Kadison and Ringrose 1997).
This entry contributed by Mohammad Sal Moslehian
Moslehian, Mohammad Sal. "Unitary Element." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/UnitaryElement.html