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--- lecture_6_slides [2017/02/08 17:33] – rupert
+++ lecture_6_slides [2017/02/08 17:34] (current) – rupert
@@ Line 14: / Line 14: @@
   * Solve using RREF.
 ==== ====
-\begin{align*}
+\begin{align*}\def\go#1#2#3{\left[\begin{smallmatrix}#1\\#2\\#3\end{smallmatrix}\right]}
+\def\ar#1{\\\xrightarrow{#1}&}
 \go{1&1&1&3}{4&2&1&2}{9&3&1&4}
 \xrightarrow{R2\to R2-4R1\text{ and }R3\to R3-9R1}&