# proof of uncertainity principle without using braket vectors

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Is there any proof of the uncertainity principle without the use of braket vectors? If so please send me where to find it.

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I don't think so as the general uncertainty principle depends on the states and in particular the commutator of the operators involved, roughly we have

$\langle \psi | [A,B] |\psi \rangle$.

It is because the commutator for the position and momentum is ~ i (in nice units) that the uncertainty principle does not depend on the states.

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• 2 weeks later...

hmm. i am thinking of how i could join these discussions...

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