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Test inline latex $\sum_{i=1}^n$

$\displaystyle \sum_{i=1}^n$

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$i\hbar\frac{\partial}{\partial t}\left|\Psi(t)\right>=H\left|\Psi(t)\right>$

1. $i\hbar\frac{\partial}{\partial t}\left|\Psi(t)\right>=H\left|\Psi(t)\right>$
test $\int\sum$
$\int\sum$