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diff --git a/Fourier Series.page b/Fourier Series.page
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@@ -98,7 +98,7 @@ We now proceed to define certain operations on these functions in Hilbert space.
$$
\begin{array}{ccl}
inner product, (f,g) & = & \int_0^{2\pi} f g dx\\
-\mid f \mid ^2 = (f, f) & = & \int_0^{2\pi} f^2 dx\\
+\mid f \mid ^2 $ = (f, f) & = & \int_0^{2\pi} f^2 dx\\
\end{array}
$$