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"\,\!" serve a creare l'immagine sempre, altrimenti crea l'immagine solo se ci sono simboli complicati.
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![{\displaystyle \langle \psi |{\hat {U}}_{1}\psi \rangle =4\pi \int _{0}^{Ro}r^{2}{\hat {U}}_{1}|\psi (r,t)|^{2}dr}](https://wikimedia.org/api/rest_v1/media/math/render/svg/5d3c71b651482be282f3d5f424174d51c0913cfd)
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