Often ignored, but turned out to be a problem when trying to compute the commutator of position and spin. Pauli matrices clearly acting on two dimensional vectors while position on infinite dimensional vectors. But a system is described as a single state vector in Dirac notation. A system can of course have both position and spin. Then how many dimensions on earth does a state vector have?(adsbygoogle = window.adsbygoogle || []).push({});

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# What is the dimension of the state vector?

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