deletions | additions       diff --git a/Combination.tex b/Combination.tex  index 101a90b..e5e6823 100644  --- a/Combination.tex  +++ b/Combination.tex 
...
\phi_{11} & \phi_{12} & \phi_{13} \\ \phi_{21} & \phi_{22} & \phi_{23} \\ \phi_{31} & \phi_{32} & \phi_{33}  \end{bmatrix}  |A|=\Psi(r_1,r_2,r_3)=\frac{1}{\sqrt{6}}||\phi_1\phi_2\phi_3||  \end{equation}  we can calculate the inverse as \begin{equation}