= Context dependence of pre- and post-selected measurements
In the <ABL rule>, probabilities depend on the full intermediate <quantum measurement> instrument. A binary <Lüders rule> <quantum measurement> preserves coherence within its unresolved complement, whereas a fully resolved <projective measurement> removes it. Summing fine-grained probabilities after <quantum measurement> does not generally reproduce the coarse-grained experiment. Different <postselection> success rates are part of the distinction.
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