Fixed R^n -> R

latex/thesis/chapters/decoding_techniques.tex

@@ -35,7 +35,7 @@ the \ac{ML} decoding problem:%
 .\end{align}%
 %
 The goal is to arrive at a formulation, where a certain objective function
-$g : \mathbb{R}^n \rightarrow \mathbb{R}^n $ must be minimized under certain constraints:%
+$g : \mathbb{R}^n \rightarrow \mathbb{R} $ must be minimized under certain constraints:%
 %
 \begin{align*}
     \text{minimize}\hspace{2mm}   &g\left( \tilde{\boldsymbol{c}} \right)\\