Quantum mechanics, orthogonality, and counting

Abstract
In quantum mechanics it is usually assumed that mutually exclusives states of affairs must be represented by orthogonal vectors. Recent attempts to solve the measurement problem, most notably the GRW theory, require the relaxation of this assumption. It is shown that a consequence of relaxing this assumption is that arithmatic does not apply to ordinary macroscopic objects. It is argued that such a radical move is unwarranted given the current state of understanding of the foundations of quantum mechanics.
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GianCarlo Ghirardi (2013). The Parts and the Whole: Collapse Theories and Systems with Identical Constituents. Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 44 (1):40-47.
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