4 ideas
7911 | Theory vanishes when one has obtained wisdom [Rahulabhadra] |
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] |
15998 | Perfect love is not in spite of imperfections; the imperfections must be loved as well [Kierkegaard] |