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] |
16705 | Whiteness isn't created in an alteration, because it is just this-being-white [Oresme] |
12155 | Statements of 'relative identity' are really statements of resemblance [Perry] |