5 ideas
17743 | De Morgan introduced a 'universe of discourse', to replace Boole's universe of 'all things' [De Morgan, by Walicki] |
16650 | 'Unity' is a particularly difficult word, because things can have hidden unity [Duns Scotus] |
22593 | Our sensation of light may not be the same as what produces the sensation [Descartes] |
16569 | The Hot, Cold, Wet and Dry of the philosophers need themselves to be explained [Descartes] |
20964 | Descartes said there was conservation of 'quantity of motion' [Descartes, by Papineau] |