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] |
10558 | Abstract objects are actually constituted by the properties by which we conceive them [Zalta] |
10557 | Abstract objects are captured by second-order modal logic, plus 'encoding' formulas [Zalta] |
7903 | The six perfections are giving, morality, patience, vigour, meditation, and wisdom [Nagarjuna] |