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\[
\require{AMScd}
\begin{CD}
A @<<< B @>>> C \\
@. @ @AAA\\
@. D @= E
\end{CD}
\]
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\[
\sum_{n=1}^\infty \frac{1}{n^2} = \frac{\pi^2}{6}
\]

(1) 
\[
\int_{\infty}^{\infty} e^{ x^2/2 } dx = \sqrt{2\pi}
\]

(2) 
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