Single Idea 17242

[catalogued under 2. Reason / F. Fallacies / 3. Question Begging]

Full Idea

'Petitio principii' is when the conclusion to be proved is disguised in other words, and put for the definition or principle from whence it is to be demonstrated.

Gist of Idea

'Petitio principii' is reusing the idea to be defined, in disguised words


Thomas Hobbes (De Corpore (Elements, First Section) [1655], 1.6.18)

Book Reference

Hobbes,Thomas: 'Metaphysical Writings', ed/tr. Calkins,Mary Whiton [Open Court 1905], p.39