Expectation value of operator A is given by following formula in Dirac notation.(adsbygoogle = window.adsbygoogle || []).push({});

<A> = <x|A|x>

where

A : Operator

<A> : Expectation value of A

|x> : State

Somehow I am unable to convince myself that this formula is true.

Would someone please explain it to me?

Thanks

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# Expectation formula in Dirac notation.

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