17744 | De Morgan started the study of relations and their properties [Walicki on De Morgan] |
13501 | De Morgan found inferences involving relations, which eluded Aristotle's syllogistic [Hart,WD on De Morgan] |
19238 | The logic of relatives relies on objects built of any relations (rather than on classes) [Peirce] |
8492 | Relations are functions with two arguments [Frege] |
10036 | In 'Principia' a new abstract theory of relations appeared, and was applied [Gödel on Russell/Whitehead] |
10816 | We can use mereology to simulate quantification over relations [Lewis] |
8525 | Relations need terms, so they must be second-order entities based on first-order tropes [Campbell,K] |
9926 | A relation is either a set of sets of sets, or a set of sets [Burgess/Rosen] |
9561 | The mathematics of relations is entirely covered by ordered pairs [Chihara] |