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] |
1389 | If memory is the sole criterion of identity, we ought to use it for other people too [Shoemaker] |
1390 | Bodily identity is one criterion and memory another, for personal identity [Shoemaker, by PG] |
19436 | Bare or primary matter is passive; it is clothed or secondary matter which contains action [Leibniz] |