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] |
12697 | Indivisibles are not parts, but the extrema of parts [Leibniz] |
16764 | The soul conserves the body, as we see by its dissolution when the soul leaves [Toletus] |