5 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] |
14617 | Predicates can't apply to what doesn't exist [Stalnaker] |
14616 | A 'Russellian proposition' is an ordered sequence of individual, properties and relations [Stalnaker] |
3031 | The greatest good is not the achievement of desire, but to desire what is proper [Menedemus, by Diog. Laertius] |