diff --git a/cw/cw.tex b/cw/cw.tex
index e3b5338..4d2df2b 100644
--- a/cw/cw.tex
+++ b/cw/cw.tex
@@ -104,7 +104,7 @@
 
 	\section*{7}
 	\subsection*{7.1}
-	$$v1 = (137, 312), v2 = (215, −187)$$
+	$$v1 = (137, 312), v2 = (215, -187)$$
 	$$mat =   \begin{pmatrix}
 			137 & 312 \\
 			215 & -187 \\