(โ,C)-isometric operators
(โ,C)-isometric operators
In this paper we study properties of (โ,C) -isometric operators.In particular, we prove that if T is an (โ,C) -isometry and Q is a quasinilpotent operator, then T + Q is an (โ,C) -isometry under suitable conditions.Moreover, we show that the class of (โ,C) -isometric operators is norm closed.Finally, we โฆ