4 ideas
9565 | Zermelo made 'set' and 'member' undefined axioms [Zermelo, by Chihara] |
3339 | For Zermelo's set theory the empty set is zero and the successor of each number is its unit set [Zermelo, by Blackburn] |
3447 | All theory is against free will, and all experience is in favour of it [Johnson,S] |
19216 | Propositions (such as 'that dog is barking') only exist if their items exist [Williamson] |