A -> not-A
  • NotAristotle
    464
    You seem to be suggesting that if both P1 and P2 are true then it's possible that C1 is false? — Michael

    Right.
    NotAristotle Options
  • Michael
    16.4k
    Right. — NotAristotle

    Which doesn't make any sense. C1 is false if and only if both "I am a man" is false and "pigs can fly" is false. Yet by stipulation "I am a man" is true; that's P1.

    So, as per the rules of logic, if both P1 and P2 are true then C1 is true. The inference is valid.
    Michael Options
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