How is conditional probability handled in quantum mechanics?
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In ordinary probability theory the conditional probability/likelihood is defined in terms of the join and marginal ... ☺ ☺
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It is done using projectors and traces, not joint wave functions, see Bobo's paper. Classical conditional probability can also be stated in terms of projectors, but representation theorems for commutative algebras that lead to representations of projectors in terms of subsets and quotients.
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