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Two predicates P and Q are said to be reversives iff they describe change in opposite directions, relative to some reference point R; if both P and Q take place (to the same extent), the change brought about by one predicate is undone by the other.

  • Illustration
    • P = enter; P denotes a change of state from S1 (x is outside) to S2 (x is inside)
    • Q = leave; Q denotes a change of state from S2 (x is inside) to S1 (x is outside)
  1. John entered the house (S1 → S2)
  2. John left the house (S2 → S1)
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