Suppose psi1 and psi2 are eigenstates of observables O1 and O2(adsbygoogle = window.adsbygoogle || []).push({});

Suppose Value of O1 of psi1 = value of O1 of psi2

Therefore, <psi1|psi2>=1

Suppose value of O2 of psi1<>value of O2 of psi2

Therefore <psi1|psi2>=0

Contradiction!how to explain

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# Problem about orthogonality

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