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Definition (Converse, Inverse, And Contrapositive)

Consider the implication $P\implies Q$. From this implication we can define 3 other implications.

  • The converse of $P\implies Q$ is the implication $Q\implies P$.
  • The inverse of $P\implies Q$ is the implication $(\sim P)\implies (\sim Q)$.
  • The contrapositive of $P\implies Q$ is the implication $(\sim Q)\implies (\sim P)$.