4 ideas
19043 | Bivalence applies not just to sentences, but that general terms are true or false of each object [Quine] |
17743 | De Morgan introduced a 'universe of discourse', to replace Boole's universe of 'all things' [De Morgan, by Walicki] |
19042 | Terms learned by ostension tend to be vague, because that must be quick and unrefined [Quine] |
5954 | All inventions of the mind aim at pleasure, and those that don't are worthless [Metrodorus of Lamp., by Plutarch] |