Theories obeying no superluminal signaling but violating no superluminal causation can achieve non-classical tasks impossible under no superluminal causation, including certifiable retrocausality in Minkowski spacetime.
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Theories with no superluminal signaling have greater information-processing power than theories with no superluminal causation
Theories obeying no superluminal signaling but violating no superluminal causation can achieve non-classical tasks impossible under no superluminal causation, including certifiable retrocausality in Minkowski spacetime.