why people make the mistake that “if not Q, then also not P”.
Um… I don’t think that’s a mistake. Given “If P, then Q”, the non-existence or falsehood of Q requires that P also not exist / be false. It leads to contradiction, otherwise.
Um… I don’t think that’s a mistake. Given “If P, then Q”, the non-existence or falsehood of Q requires that P also not exist / be false. It leads to contradiction, otherwise.