I'm a little confused about the expression for the electron density.(adsbygoogle = window.adsbygoogle || []).push({});

For example in Marder's Condensed Matter Physics, he writes this

[tex] \rho(\vec{r}) = N \int \Psi^{*} \delta( \vec{r} - \vec{r}_1) \Psi d\vec{r}_1 \ldots d\vec{r}_N \delta [/tex]

what's going on?

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# Quantum Mechanics: Expression for electron density

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