21 ideas
9307 | Modern Western culture suddenly appeared in Jena in the 1790s [Svendsen] |
9297 | You can't understand love in terms of 'if and only if...' [Svendsen] |
10282 | Logic is the study of sound argument, or of certain artificial languages (or applying the latter to the former) [Hodges,W] |
10283 | A formula needs an 'interpretation' of its constants, and a 'valuation' of its variables [Hodges,W] |
10284 | There are three different standard presentations of semantics [Hodges,W] |
10285 | I |= φ means that the formula φ is true in the interpretation I [Hodges,W] |
10288 | Down Löwenheim-Skolem: if a countable language has a consistent theory, that has a countable model [Hodges,W] |
10289 | Up Löwenheim-Skolem: if infinite models, then arbitrarily large models [Hodges,W] |
10287 | If a first-order theory entails a sentence, there is a finite subset of the theory which entails it [Hodges,W] |
10286 | A 'set' is a mathematically well-behaved class [Hodges,W] |
9308 | If subjective and objective begin to merge, then so do primary and secondary qualities [Svendsen] |
9309 | Emotions have intentional objects, while a mood is objectless [Svendsen] |
9304 | Death appears to be more frightening the less one has lived [Svendsen] |
9301 | Boredom is so radical that suicide could not overcome it; only never having existed would do it [Svendsen] |
9302 | We are bored because everything comes to us fully encoded, and we want personal meaning [Svendsen] |
9310 | The profoundest boredom is boredom with boredom [Svendsen] |
9298 | We can be unaware that we are bored [Svendsen] |
9311 | We have achieved a sort of utopia, and it is boring, so that is the end of utopias [Svendsen] |
9303 | The concept of 'alienation' seems no longer applicable [Svendsen] |
16713 | Philosophers are the forefathers of heretics [Tertullian] |
6610 | I believe because it is absurd [Tertullian] |