diff --git a/sections/sl2-sl3.tex b/sections/sl2-sl3.tex
@@ -821,7 +821,7 @@ eigenvalue \(\lambda([E_{1 2}, E_{2 1}]) - 2k\) of the action of \(h\) on
\(\bigoplus_{k \in \mathbb{N}} V_{\lambda + k (\alpha_1 - \alpha_2)}\) is
\(V_{\lambda + k (\alpha_1 - \alpha_2)}\), the weights of \(V\) appearing the
string \(\lambda, \lambda + (\alpha_1 - \alpha_2), \ldots, \lambda + k
-(\alpha_1 - \alpha_2), \ldots\) must be symmetric with respect to the the line
+(\alpha_1 - \alpha_2), \ldots\) must be symmetric with respect to the line
\(B(\alpha_1 - \alpha_2, \alpha) = 0\). The picture is thus
\begin{center}
\begin{tikzpicture}