On The Absolute Value of Unbounded Operators

Imene Boucif, Souheyb Dehimi, Mohammed Hichem Mortad

The primary purpose of the present paper is to investigate when relations of the types $|AB|=|A||B|$, $|A\pm B|\le |A|+|B|$, $||A|-|B||\le |A\pm B|$ and $|\overline{\text{Re} A}|…