4 ideas
15927 | Definition just needs negation, known variables, conjunction, disjunction, substitution and quantification [Weyl, by Lavine] |
6710 | You can only define a statement that something is 'true' by referring to its functional possibilities [James] |
22305 | If the hypothesis of God is widely successful, it is true [James] |
10121 | Contradiction is not a sign of falsity, nor lack of contradiction a sign of truth [Pascal] |