6 ideas
17833 | The first-order ZF axiomatisation is highly non-categorical [Hallett,M] |
17834 | Non-categoricity reveals a sort of incompleteness, with sets existing that the axioms don't reveal [Hallett,M] |
17837 | Zermelo allows ur-elements, to enable the widespread application of set-theory [Hallett,M] |
10247 | We have no adequate logic at the moment, so mathematicians must create one [Veblen] |
17836 | The General Continuum Hypothesis and its negation are both consistent with ZF [Hallett,M] |
19739 | The maxim for suicide is committed to the value of life, and is thus contradictory [Kant] |