The Fuglede-Putnam theorem for (p,k)-quasihyponormal operators
The Fuglede-Putnam theorem for (p,k)-quasihyponormal operators
We show that if is a -quasihyponormal operator and is a -hyponormal operator, and if , where is a quasiaffinity (i.e., a one-one map having dense range), then is a normal and moreover is unitarily equivalent to .