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7.3: Вищі розміри
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\[-\frac{1}{2h^2}\, \Big[\psi_{m+1,n} + \psi_{m,n+1} - 4\psi_{mn} + \psi_{m-1,n} + \psi_{m,n-1} \Big] + V_{mn} \psi_{mn} = E \psi_{mn}.\] \[\frac{\partial \psi}{\partial x}(\vec{r}_\mu)\;\, \approx \f...\[-\frac{1}{2h^2}\, \Big[\psi_{m+1,n} + \psi_{m,n+1} - 4\psi_{mn} + \psi_{m-1,n} + \psi_{m,n-1} \Big] + V_{mn} \psi_{mn} = E \psi_{mn}.\] \[\frac{\partial \psi}{\partial x}(\vec{r}_\mu)\;\, \approx \frac{1}{2h} \left(\psi_{\mu+N} - \psi_{\mu-N}\right) \] \[\nabla^2\psi(\vec{r}_\mu) \approx \frac{1}{h^2} \left(\psi_{\mu+N} + \psi_{\mu+1} - 4\psi_{\mu} + \psi_{\mu-N} + \psi_{\mu-1}\right). \]