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] |
4316 | Either all action is rational, or reason dominates, or reason is only concerned with means [Cottingham] |
23053 | The great interest of the human race is cordial unity and unlimited mutual aid [Owen] |