References

Journal of Mathematical Sciences: Advances and Applications

ON CLOSEDNESS OF THE RANGE OF THE OPERATOR DEFINED ON WHEN IS M-HYPONORMAL

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[2] J. Stampfli, Compact perturbations, normal eigenvalues and a problem of Salinas, J. London Math. Soc. 9(2) (1974), 165-175.

[3] J. Stampfli, On the range of a hyponormal derivation, Proc. Amer. Math. Soc. 52 (1975), 117-120.

[4] A. Uchiyama and T. Yoshino, Weyl’s theorem for p-hyponormal or M-hyponormal operators, Glasgow Math. J. 43 (2001), 375-381.