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] |
16745 | No one even knows the nature and properties of a fly - why it has that colour, or so many feet [Bacon,R] |