5 ideas
17744 | De Morgan started the study of relations and their properties [De Morgan, by Walicki] |
13501 | De Morgan found inferences involving relations, which eluded Aristotle's syllogistic [De Morgan, by Hart,WD] |
15312 | We get the idea of power by abstracting from ropes, magnets and electric shocks [Priestley] |
3448 | Do new ideas increase the weight of the brain? [Dance] |
15311 | Attraction or repulsion are not imparted to matter, but actually constitute it [Priestley] |