<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Seddik. A</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">CLOSED OPERATOR INEQUALITIES AND OPEN PROBLEMS</style></title><secondary-title><style face="normal" font="default" size="100%">Mathematical Inequalities and Applications</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2011</style></year></dates><volume><style face="normal" font="default" size="100%">14</style></volume><pages><style face="normal" font="default" size="100%">147-154</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">In [3, 4] , we have given some characterizations of some subclasses of complex Hilbert&lt;br&gt;space normal operators by inequalities. In this note, we shall reformulate these results using a&lt;br&gt;concept of closed inequalities. Also, we shall give some new characterizations. Some open&lt;br&gt;problems concerning closed inequalities are posed at the end of this note.</style></abstract></record></records></xml>