Abstract
I WISH to point out that in the accepted theory the association of operators and observations is very intricate precisely in the simplest cases. You give me a splinter of a diamond crystal. Its state function is to be an antisymmetric function of the co-ordinates x k of the n carbon nuclei the specimen contains. Can this function give information on the shape of the splinter? The label k is not connected with any location, with any point of the crystal lattice! Let the splinter be needle-shaped. I can measure its length. What operator is associated with this measurement? We must remember that only operators symmetric with respect to all the x k are meaningful.
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SCHRÖDINGER, E. Measurement of Length and Angle in Quantum Mechanics. Nature 173, 442 (1954). https://doi.org/10.1038/173442a0
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DOI: https://doi.org/10.1038/173442a0
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