most recent 30 from http://mathoverflow.net 2013-05-21T09:55:03Z http://mathoverflow.net/feeds/user/20298 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/62895/the-norm-isometry-group/84677#84677 ali hadi 2012-01-01T10:30:19Z 2012-01-01T10:30:19Z

<p>In matrix analysis, we say that a matrix A preserves the norm||.||, if ||AX||=||X|| for all X. a collection of such matrices makes a group, that is called isometry group for such norm. for example the isometry group for L2-norm contains of all unitary matrices. </p>