"Another way of expressing the peculiar situation is: the best possible knowledge of a whole does not necessarily include the best possible knowledge of all its parts, even though they may be entirely separate and therefore virtually capable of being "best possibly known," i.e., of possessing, each of them, a representative of its own. The lack of knowledge is by no means due to the interaction being insufficiently known—at least not in the way that it could possibly be known more completely—it is due to the interaction itself. Attention has recently been called to the obvious but very disconcerting fact that even though we restrict the disentangling measurements to one system, the representative obtained for the other system is by no means independent of the particular choice of observations which we select for that purpose and which by the way are entirely arbitrary. It is rather discomforting that the theory should allow a system to be steered or piloted into one or the other type of state at the experimenter's mercy in spite of his having no access to it. [italics in the original]"
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"Discussion of Probability Relations Between Separated Systems" (Oct 28, 1935) Proceedings of the Cambridge Philosophical Society, Vol. 31, Issue 4, pp. 555-556. Ref: Albert Einstein, Boris Podolsky, , "Can Quantum-Mechanical Description of Physical Reality Be Considered Complete?" (1935) Physical Review Vol. 47, p. 777.
https://en.wikiquote.org/wiki/Erwin_Schr%C3%B6dinger
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Erwin Schrödinger
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