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] |
4871 | A thing is free if it acts only by the necessity of its own nature [Spinoza] |
20422 | The experience of expression and communication are intermingled in art [Croce] |