vector\] yields one or the other of the acceptable values – relative to the particular point $O$. But for an arbitrary different point $O'$, of course, unacceptable values occur. \[...\]

One could go on indefinitely with more examples. \[...\] Already for the single instant things go wrong. At no moment does there exist an ensemble of classical states of the model that squares with the totality of quantum mechanical statements of this moment. \[...\] we saw that it is not possible smoothly to take over models and to ascribe, to the momentarily unknown or not exactly known variables, nonetheless determinate values, that we simply don’t know.

The problem is indeed unsolvable if one insists on the existence of a [*single*]{} vector $J$ of values determining all linear combinations $u\cdot J$ of the angular momentum. For example, in measuring the inner product $u\cdot J$ of the angular momentum $J$ with four or more triplewise linearly independent unit vectors $u$, one obtains in each case values from the discrete spectrum of $u\cdot J$, and these spectra are inconsistent with a precise value of $J$. This is explained by Schr[ö]{}dinger in detail on p. 164 in the context of a simpler one-parameter example 