diff --git a/main.tex b/main.tex
index cbe80ef..ede4a46 100644
--- a/main.tex
+++ b/main.tex
@@ -101,7 +101,7 @@ code-for-last-col = \color{blue}
 		\item Manifolds $\textcolor{blue}{M} := \mathbb{S}^3 /_ \sim$ where $\sim $ identifies the orbits of finite $H \leq SO(4)$ finite
 
 		\item Helmholtz equation on $M$ given by
-		      $$(\Delta + E_\textcolor{red}{\beta}^M)\psi_\textcolor{red}{\beta}^{M, i} = 0$$
+		      $$(\Delta + E_\textcolor{red}{\beta}^M\textcolor{blue}{M})\psi_\textcolor{red}{\beta}^{M, i} = 0$$
 
 		\item In fact $E_\textcolor{red}{\beta}^m = \textcolor{red}{\beta}^2-1$ for $\textcolor{red}{\beta} \in \mathbb{N}$ we call $\textcolor{red}{\beta}$ a wave number