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In line math {$ \int x^2 -x^3 dx $}
{$ \Longrightarrow $}
{$$\left[ {\bf X} + {\rm a} \geq \underline{\hat a} \sum_i^N \lim_{x \rightarrow k} \delta C \right]$$}
{$$\left [ - \frac{\hbar^2}{2 m} \frac{\partial^2}{\partial x^2} + V \right ] \Psi = i \hbar \frac{\partial}{\partial t} \Psi $$}
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