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Joel Wizansky's avatar

FWIW the logical flaw you were discussing in Trump's silly claim that being impeached but not convicted made him immune from criminal prosecution, because the law says if he IS convicted he can still be prosecuted, is a basic fallacy that in mathematical logic would be called "assuming the inverse." (I heard Chutkin called it something like "negating the antecedent", but same difference.)

So if you start with the statement 'p implies q', the inverse would be 'not-p implies not-q', and it's an elementary principle that a statement being true does not imply the inverse is true. Thus if you say all fire engines are red, that doesn't mean anything that isn't a fire engine is not red. I mean.... duh.

Jerry's avatar

Beautiful picture!

The car's nice too. 👌

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