Petitio principii
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Petitio principii is the fallacy of
- accepting as a proof an argumentation whose premises are not known to be true, or
- unwittingly assuming the proposition that one is trying to establish.
- using in an intended proof a premise not known to be true by the intended audience.
Links
- Ockham Summa Logicae III-4 c15 "DE FALLACIA PETITIONIS PRINCIPII"
- SEP article 'Fallacies'