Math

Let's add some math
{3 ~ \times ~ 3 ~ = ~ 9}
Math was added
\begin{align}
|A \rangle &= |B\rangle + |C\rangle \\
|C \rangle &= (-1+2i)|D \rangle \\
|D \rangle &= \int_{-\infty}^{\infty} e^{-x^2} |x\rangle \, \mathrm{d}x \,.
|A \rangle &= |B\rangle + |D\rangle \\
\end{align}
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