An example of a ternary relation (i.e., between three individuals) is: " was introduced to by ", where is a 3-tuple of persons; for example, "Beatrice Wood was introduced to Henri-Pierre Roché by Marcel Duchamp" is true, while "Karl Marx was introduced to Friedrich Engels by Queen Victoria" is false.
Mourt's Relation | Equivalence relation | Tully–Fisher relation | Tully-Fisher relation | The Descent of Man, and Selection in Relation to Sex | Same Height Relation |