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13.4: Derivar la ecuación de Thomas-Fermi
https://espanol.libretexts.org/Ingenieria/Energia_directa_(Mitofsky)/13%3A_An%C3%A1lisis_Thomas-Fermi/13.04%3A_Derivar_la_ecuaci%C3%B3n_de_Thomas-Fermi
$\nabla^2 V = \frac{1}{r^2} \frac{\partial}{\partial r} \left[r^2 \frac{\partial}{\partial r} \left(\frac{-y}{r}\right)\right] \nonumber$ \[ \nabla^2 V = \frac{1}{r^2} \frac{\partial}{\partial r} ... $\nabla^2 V = \frac{1}{r^2} \frac{\partial}{\partial r} \left[r^2 \frac{\partial}{\partial r} \left(\frac{-y}{r}\right)\right] \nonumber$ $\nabla^2 V = \frac{1}{r^2} \frac{\partial}{\partial r} \left[ r^2 \left( \frac{y}{r^2} - \frac{1}{r}\frac{\partial y}{\partial r} \right)\right] \nonumber$ $\nabla^2 V = \frac{1}{r^2} \left( \frac{\partial y}{\partial r} - \frac{\partial y}{\partial r} - r^2\frac{\partial^2 y}{\partial r^2}\right) \nonumber$

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