8 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] |
8406 | Not all explanations are causal, but if a thing can be explained at all, it can be explained causally [Sanford] |
22745 | Pherecydes said the first principle and element is earth [Pherecydes, by Sext.Empiricus] |
8407 | A totality of conditions necessary for an occurrence is usually held to be jointly sufficient for it [Sanford] |
5883 | Pherecydes was the first to say that the soul is eternal [Pherecydes, by Cicero] |