deletions | additions       diff --git a/Eigenvalues.tex b/Eigenvalues.tex  index 70e7426..b556d2e 100644  --- a/Eigenvalues.tex  +++ b/Eigenvalues.tex 
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\det ( A) A^{-1} = \sum_{s=0}^{n-1}A^{s}\sum_{k_1,k_2,\ldots ,k_{n-1}}\prod_{l=1}^{n-1} \frac{(-1)^{k_l+1}}{l^{k_l}k_{l}!}\mathrm{tr}(A^l)^{k_l},  \end{equation} Consider the use of an object $|[A_11,A_22]|=A_11A_22-A_12A_21$...