deletions | additions       diff --git a/Eigenvalues.tex b/Eigenvalues.tex  index 8f7ceab..f809c66 100644  --- a/Eigenvalues.tex  +++ b/Eigenvalues.tex 
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Then for a 3x3 matrix the similar thing \begin{equation}  |[A_{11},A_{22},A_{33}]| = |[A_{11},A_{22}]|A_{33}+|{A_{12},A_{23}]|+|{A_{13},A_{21}]|A_{32} |[A_{11},A_{22}]|A_{33}+|[A_{12},A_{23}]|+|{A_{13},A_{21}]|A_{32}  \end{equation}