I have two quick questions:(adsbygoogle = window.adsbygoogle || []).push({});

1. Why if say [x,y] = 0, it implies that there is a mutual complete set of eigenkets?

where x and y can be anything, like momentum, position operators.

2. If an operator is not hermitian, why isn't it an observable? (More specifically, why isn't its eigenvalue an observable?)

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# Commutators, mutual eigenkets, and observables

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