could someone please help with the proof of this,it's from JJ Sakurai book modern quantum mechanics
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Qmechanic
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Help in what way? – AfterShave Oct 16 '22 at 04:31
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Possible duplicates: https://physics.stackexchange.com/q/24116/2451 , https://physics.stackexchange.com/q/230041/2451 and links therein. – Qmechanic Oct 16 '22 at 05:52