I Boucif, S Dehimi, M Hichem Mortad - arXiv e-prints, 2018 - ui.adsabs.harvard.edu
The primary purpose of the present paper is to investigate when relations of the types $|
AB|=| A|| B| $, $| A\pm B|\leq| A|+| B| $, $|| A|-| B||\leq| A\pm B| $ and $|\overline {\text {Re} …