Is quantum mechanics non-local?
Henry P. Stapp
Abstract
A recent proof, couched in the symbolic language of modal logic, shows that a well-defined formulation of the question posed in the title is answered affirmatively. In a paper with the same title Unruh has tried in various ways to translate the symbolic proof into normal prose, and has claimed that the proof must fail in some way or another. A correct translation is given here, and it is explained why the difficulties encountered by Unruh do not actually arise.
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