A fallacy in which a conclusion is taken for granted in the premises; begging the question.
- ‘This, with great respect, is a petitio principii - reasoning which assumes the very thing which requires decision.’
- ‘Here I shall simply observe that the objection is a gross petitio principii.’
Latin, literally ‘laying claim to a principle’.
We take a look at several popular, though confusing, punctuation marks.