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--- lecture_10_slides [2017/02/21 10:04] – rupert
+++ lecture_10_slides [2017/02/21 10:04] (current) – rupert
@@ Line 5: / Line 5: @@
   * A linear equation can be written using [[row-column multiplication]].
-  * e.g. $ 2x-3y+z=8$ is same as $ \m{2&-3&1}\m{x\\y\\z}=8$
+  * e.g. $ \newcommand{\m}[1]{\left[\begin{smallmatrix}#1\end{smallmatrix}\right]} 2x-3y+z=8$ is same as $ \m{2&-3&1}\m{x\\y\\z}=8$
   * or $ a\vec x=8$ where $a=\m{2&-3&1}$ and $\vec x=\m{x\\y\\z}$.