The Schrödinger Equation

This is the time dependent Schrödinger equation with \I.

\[\I \hbar \frac{\partial}{\partial t} \Psi(\boldsymbol{r},t) = \biggl(- \frac{\hbar^2}{2m} \boldsymbol{\nabla}^2 + \hat{V}(\boldsymbol{r}) \biggr) \Psi(\boldsymbol{r},t).\]

This is the time dependent Schrödinger equation with \mathrm{i}.

\[\mathrm{i} \hbar \frac{\partial}{\partial t} \Psi(\boldsymbol{r},t) = \biggl(- \frac{\hbar^2}{2m} \boldsymbol{\nabla}^2 + \hat{V}(\boldsymbol{r}) \biggr) \Psi(\boldsymbol{r},t).\]

Maybe, the macro for the complex numbers, "\\C":"\\mathbb{C}" works … $\C$.