Weyl's theorem for p-hyponormal or M-hyponormal operators
Weyl's theorem for p-hyponormal or M-hyponormal operators
In 1997, M. Cho, M. Ito and S. Oshiro showed that Weyl's theorem holds for p-hyponormal operators, for any p>0. In this note we give another proof of this result. Also, it is shown that Weyl's theorem holds for M-hyponormal operators. Further, in 1962, Stampfli showed that if T is …