| There is a group of one another easily, and the function independent of the Hermitian operators a (a1, a2, ... ...), their common eigenfunctions denoted ψk, k is a _set_ of quantum numbers in general mark. _Set_ after a given k able to determine a possible system state, called (a1, a2, ... ...) constitute a system of mechanical quantities of a _set_ of easy to fully _set_ (complete _set_ of commuting observables, denoted by csco). |
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