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] |
17836 | The General Continuum Hypothesis and its negation are both consistent with ZF [Hallett,M] |
6019 | If someone squashed a horse to make a dog, something new would now exist [Mnesarchus] |
16157 | Insurance on the original ship would hardly be paid out if the plank version was wrecked! [Frede,M] |