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A fortiori argument
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Everything about A Fortiori Argument totally explained

The Latin phrase literally means one of the following:* "from the stronger"
  • "even more so"
  • "with even stronger reason" It denotes a proof of a claim by means of an already proved stronger claim. For example, if it's forbidden to ride a bike with an extra passenger, then it's also forbidden to ride a bike with two extra passengers. Or, if one can lift a 100 lb object, then it follows that one can lift a 50 lb object.
There are two types of the a fortiori argument:
  • a maiore ad minus: from bigger to smaller
  • a minore ad maius: from smaller to bigger The a fortiori argument is most often used in order to reinforce a claim, though sometimes also to incorrectly justify a claim taking it as a premise (petitio principii).

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