On Contextuality as a Feature of Logic and Probability Theory
Abstract
In quantum mechanics, not everything that can be observed can be observed simultaneously. Observational data exhibits contextuality -- a generalisation of nonlocality -- if the result of an observation is necessarily dependent on which combination of observables was measured. This article gives a mathematical introduction to contextuality, emphasising its nature as a general feature of probability theory and logic, rather than of any particular quantum theory.
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