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This is a test of TeX code

$$\frac{-\hbar}{2m}\frac{d\Psi^2}{dx^2}+V(x)\Psi = E\Psi$$

Mott insulator
Testing tags and references: Mott insulators are materials that should conduct electricity according to traditional band theories, but experimentally they are insulators because their electrons are locked to the atoms (add here the reference).