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nortonian said:They can be derived from each other only in the case of diagonal elements, the energy eigenstates.
The proof makes no use of a particular basis an operators matrix representation is diagonal in. Its simply got to do with operators have matrix representation ie given ANY basis |bi>, O = ∑∑ |bi><bi|O|bj><bj| = ∑∑ <bi|O|bj>|bi><bj|. <bi|O|bj> is the matrix representation of O. In matrix mechanics the state doesn't change - only the operator so the state isn't explicitly part of it. Thus there is a one to one correspondence between matrix and wave mechanics. To be explicit given any matrix in matrix mechanics we can find the corresponding operator in wave mechanics and conversely. That's all there is to it really.
Now to support your claim detail the exact error in what I wrote above. Not a reference, but the exact error.
Thanks
Bill
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