35 ideas
18755 | Validity is explained as truth in all models, because that relies on the logical terms [McGee] |
18751 | Natural language includes connectives like 'because' which are not truth-functional [McGee] |
18761 | Second-order variables need to range over more than collections of first-order objects [McGee] |
18753 | An ontologically secure semantics for predicate calculus relies on sets [McGee] |
18754 | Logically valid sentences are analytic truths which are just true because of their logical words [McGee] |
18757 | Soundness theorems are uninformative, because they rely on soundness in their proofs [McGee] |
1553 | No perceptible object is truly straight or curved [Protagoras] |
18760 | The culmination of Euclidean geometry was axioms that made all models isomorphic [McGee] |
3523 | Shadows are supervenient on their objects, but not reducible [Maslin] |
3517 | 'Ontology' means 'study of things which exist' [Maslin] |
1549 | Everything that exists consists in being perceived [Protagoras] |
1545 | Protagoras was the first to claim that there are two contradictory arguments about everything [Protagoras, by Diog. Laertius] |
1547 | Man is the measure of all things - of things that are, and of things that are not [Protagoras] |
3305 | There is no more purely metaphysical doctrine than Protagorean relativism [Benardete,JA on Protagoras] |
3313 | If my hot wind is your cold wind, then wind is neither hot nor cold, and so not as cold as itself [Benardete,JA on Protagoras] |
3317 | You can only state the problem of the relative warmth of an object by agreeing on the underlying object [Benardete,JA on Protagoras] |
247 | God is "the measure of all things", more than any man [Plato on Protagoras] |
606 | Protagoras absurdly thought that the knowing or perceiving man is 'the measure of all things' [Aristotle on Protagoras] |
612 | Relativists think if you poke your eye and see double, there must be two things [Aristotle on Protagoras] |
3538 | Analogy to other minds is uncheckable, over-confident and chauvinistic [Maslin] |
3540 | If we are brains then we never meet each other [Maslin] |
3518 | I'm not the final authority on my understanding of maths [Maslin] |
3530 | Denial of purely mental causation will lead to epiphenomenalism [Maslin] |
3520 | Token-identity removes the explanatory role of the physical [Maslin] |
18762 | A maxim claims that if we are allowed to assert a sentence, that means it must be true [McGee] |
6016 | Early sophists thought convention improved nature; later they said nature was diminished by it [Protagoras, by Miller,FD] |
1580 | For Protagoras the only bad behaviour is that which interferes with social harmony [Protagoras, by Roochnik] |
205 | Protagoras contradicts himself by saying virtue is teachable, but then that it is not knowledge [Plato on Protagoras] |
1659 | Protagoras seems to have made the huge move of separating punishment from revenge [Protagoras, by Vlastos] |
532 | Successful education must go deep into the soul [Protagoras] |
1552 | He spent public money on education, as it benefits the individual and the state [Protagoras, by Diodorus of Sicily] |
3528 | Causality may require that a law is being followed [Maslin] |
3525 | Strict laws make causation logically necessary [Maslin] |
3527 | Strict laws allow no exceptions and are part of a closed system [Maslin] |
1551 | He said he didn't know whether there are gods - but this is the same as atheism [Diogenes of Oen. on Protagoras] |