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] |
19043 | Bivalence applies not just to sentences, but that general terms are true or false of each object [Quine] |
17836 | The General Continuum Hypothesis and its negation are both consistent with ZF [Hallett,M] |
19042 | Terms learned by ostension tend to be vague, because that must be quick and unrefined [Quine] |
13304 | Learned men gain more in one day than others do in a lifetime [Posidonius] |
20820 | Time is an interval of motion, or the measure of speed [Posidonius, by Stobaeus] |