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what is difference between the square of an operator and the expectation value of that operator
operator $\hat A$ is a mathematical rule that when applied to a ket $\hat A|\phi\rangle$ transforms it into another ket $\hat A|\phi '\rangle $ and too for bra. $\langle \phi| \hat A|\phi\rangle$ ...
Apr 22 '12 at 11:12
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