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![\left[-\dfrac{\hbar^2}{2 m} \nabla^2 + \hat{V}(\mathbf{r}) \right] \psi (\mathbf{r}) = E\cdot \psi (\mathbf{r})](http://s0.wp.com/latex.php?latex=%5Cleft%5B-%5Cdfrac%7B%5Chbar%5E2%7D%7B2+m%7D+%5Cnabla%5E2+%2B+%5Chat%7BV%7D%28%5Cmathbf%7Br%7D%29+%5Cright%5D+%5Cpsi+%28%5Cmathbf%7Br%7D%29+%3D+E%5Ccdot+%5Cpsi+%28%5Cmathbf%7Br%7D%29&bg=ffffff&fg=000000&s=0 "\left[-\dfrac{\hbar^2}{2 m} \nabla^2 + \hat{V}(\mathbf{r}) \right] \psi (\mathbf{r}) = E\cdot \psi (\mathbf{r})")
