4 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] |
10494 | Several words may label a category; one word can name several categories; some categories lack words [Ellen] |
18284 | Particulars can be verified or falsified, but general statements can only be falsified (conclusively) [Popper] |