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Emile comments on Open Thread, October 7 - October 12, 2013 - Less Wrong Discussion

5 Post author: Thomas 07 October 2013 02:52PM

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Comment author: Emile 09 October 2013 08:16:55PM 3 points [-]

If P, then Q. Therefore if !Q, then !P.

...this is quite wrong as well. E.g. If you are a man, you're a human. Therefore if you're not a man you're not a human :-P

No, it would be "Therefore if you're not a human you're not a man", which does follow. The formal logic is fine.

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