On (N,M)-a-normal And (N, M)-a-quasinormal Semi- Hilbert Space Operators
arXiv:1912.03304
Abstract
The purpose of the paper is to introduce and study a new class of operators on semi-Hilbertian spaces i.e.; spaces generated by positive semidefinite sesquilinear forms. Let H be a Hilbert space and let A be a positive bounded operator on H .