References

ON PRENORMAL OPERATORS


[1] B. Fuglede, A commutativity theorem for normal operators, Proc. N. A. S. 36 (1950), 35-40

[2] P. R. Halmos, A Hilbert Space Problem Book, Springer-Verlag, New York, 1982.

[3] A. A. S. Jibril, On 2-normal operators, Dirasat, Natural and Engineering Sciences 23(2) (1996), 190-195.

[4] A. A. S. Jibril, On mutually normal operators, Abhath Al-Yarmouk Basic Sciences and Engineering 8(1) (1999), 53-60.

[5] A. A. S. Jibril, On n-power normal operators, The Arabian Journal for Sciences and Engineering 33(2A) (2008), 247-251.

[6] E. Kamei, Operators with skew-commutative Cartesian parts, Math. Japonica 25(4) (1980), 431-432.