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when toggle format what by license comment
Sep 27, 2015 at 11:59 comment added David E Speyer @Arul If I understand you correctly, you are wrong. Consider $\left( \begin{smallmatrix} 2 & 0 \\ 0 & 1/2 \end{smallmatrix} \right)$.
Sep 27, 2015 at 11:26 history edited Carlo Beenakker CC BY-SA 3.0
added 274 characters in body
Sep 27, 2015 at 11:20 history answered Carlo Beenakker CC BY-SA 3.0