Causal Contrapositive?

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• 1 Like

  iolaw-12 Alum Member

  July 2023 106 karma

  If A ALWAYS causes B then yes you can take the contrapositive: if you don't have B you also don't have A. But if A simply CAN cause B but doesn't always, then there is no contrapositive to be taken.
• 1 Like

  henry.ewing Live Member Sage 7Sage Tutor

  July 2023 59 karma

  Second what iolaw-12 says. Real world example: Smoking causes cancer, but not in everybody. Just because someone does not have cancer, that does not imply that they are not a smoker.
• rdyoung12 Alum Member

  July 2023 edited July 2023 306 karma

  Not sure what you mean by causal but I think this will help you (from JW's vid):

  1) Sufficient satisfied: rule triggers, necessary must be satisfied

  2) Sufficient failed: rule irrelevant, necessary is free to satisfy or fail

  3) Necessary failed: rule triggers, sufficient must fail

  4) necessary satisfied: rule irrelevant, sufficient could be true or false