On The Absolute Value of Unbounded Operators

Abstract

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 $|\overline{\text{Re}A}|\le |A|$ (among others) hold in an unbounded operator setting. As interesting consequences, we obtain a characterization of (unbounded) self-adjointness as well as a characterization of invertibility for the class of unbounded normal operators.

arXiv comment19 pages