In Shankars "Principle of Quantum Mechanics" in Chapter 4, page 122, he explains what the "Collapse of the State Vector" means.(adsbygoogle = window.adsbygoogle || []).push({});

I get that upon measurement, the wave function can be written as a linear combination of the eigenvectors belonging to a operator which corresponds to the measurement (because the operators are hermitian and their eigenvectors form a basis).

But then he goes on to say, thatthe measurement forces the state vector[itex]|\psi>[/itex] into

the eigenstate [itex]|\omega>[/itex].

ButHOWdoes the operator do that? I can't find a single equation which describes the collapse of the wave function.

So my question is, what happens mathematically behind the scenes?

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# I What happens mathematically when a wave function collapses

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