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--- determinant_of_a_3x3_matrix [2015/03/23 12:03] – rupert
+++ determinant_of_a_3x3_matrix [2015/03/24 10:05] (current) – rupert
@@ Line 1: / Line 1: @@
-If $A=\mat{a_{11}&a_{12}&a_{13}\\a_{21}&a_{22}&a_{23}\\a_{31}&a_{32}&a_{33}}$ is a $3\times 3$ matrix, then
+If $\def\mat#1{\begin{bmatrix}#1\end{bmatrix}}A=\mat{a_{11}&a_{12}&a_{13}\\a_{21}&a_{22}&a_{23}\\a_{31}&a_{32}&a_{33}}$ is a $3\times 3$ matrix, then
 \[\det A=a_{11}C_{11}+a_{12}C_{12}+a_{13}C_{13}.\]
 Here $C_{ij}$ are the [[cofactors]] of $A$.