5 ideas
17832 | Zermelo showed that the ZF axioms in 1930 were non-categorical [Zermelo, by Hallett,M] |
13028 | Replacement was added when some advanced theorems seemed to need it [Zermelo, by Maddy] |
17626 | The antinomy of endless advance and of completion is resolved in well-ordered transfinite numbers [Zermelo] |
16570 | Elements are found last in dismantling bodies, and first in generating them [Albert of Saxony] |
22908 | When one element contains the grounds of the other, the first one is prior in time [Leibniz] |