나건호다 !!!
[math]\displaystyle{ testing... e^x \\ e^{x^2} \\ \nabla }[/math]
[math]\displaystyle{
i\hbar \frac{\partial \psi}{\partial t} = - \frac{\hbar^2}{2m} \nabla^2 \psi + V\psi
}[/math]
[math]\displaystyle{ \oint_C \vec{F} \cdot d\vec{r} = \iint_D \left( \vec{\nabla} \times \vec{F} \right ) \cdot d\vec{S} }[/math]