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## Main Question or Discussion Point

I know that in QM, one observation like position will alter the wavefunction so that momentum changes. But how do we see this mathematically when we include time dependence, whether in matrix mechanics or wave mechanics? Is it as simple as writing PQx where x is the state, Q position matrix, P momentum matrix? How do we include the time dependence in the matrices, i.e. so the P measurement is done t seconds after Q? Thanks.