4 ideas
3339 | For Zermelo's set theory the empty set is zero and the successor of each number is its unit set [Zermelo, by Blackburn] |
9565 | Zermelo made 'set' and 'member' undefined axioms [Zermelo, by Chihara] |
22406 | The maximisation of happiness must be done fairly [Rawls, by Smart] |
5994 | Is the cosmos open or closed, mechanical or teleological, alive or inanimate, and created or eternal? [Robinson,TM, by PG] |