Re: Goodbye,Descartes
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No horned animal is a unicorn
All unicorns are horned animals
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Unicorns do not exist
Haven't read this book so can't comment beyond that, but I believe the above is exactly where Aristotle would have finished.
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To be fair to Devlin ( author), he may have been making a decent point with the example, but at the time I didn't want anything to do with any deductions arrived at by treating "animal" as referring to the same entity in both premises.
oh well, luckyme
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