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diff --git a/manual/chapters/interferometry.tex b/manual/chapters/interferometry.tex
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--- a/manual/chapters/interferometry.tex
+++ b/manual/chapters/interferometry.tex
@@ -76,7 +76,7 @@ similar to that used for the Michelson interferometer, you can show that:
\delta = 2d\cos\theta
\end{equation}%eq.2
If this path difference produces
-constructive interference, then $\delta$ is some integer multiple of , $\lambda$ namely,
+constructive interference, then $\delta$ is some integer multiple of $\lambda$, namely,
\begin{equation}
m\lambda = 2d\cos\theta %eq.3
\end{equation}%eq.3