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Willem de Muynck/

David Bohm’s hidden-variables theory as seen from a present-day physical perspective.

David Bohm’s hidden-variables theory as a theory underpinning quantum mechanics’ is discussed from a present-day physical perspective in which recent developments within quantum mechanics are taken into account. In particular the role of the measuring instrument, neither in quantum mechanics nor in Bohm’s theory sufficiently valued as a crucial element of the theory, will be highlighted. Recent developments mathematically generalizing quantum mechanical observables from Hermitian operators to positive operator-valued measures are applied to discuss the relation between the quantum mechanical problem of joint nonideal measurement of incompatible observables and the problem of quantum mechanical nonlocality, with an eye to the connection with hidden-variables theories.

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