Concept
What is an endorelation?
Stephen Davies, Ph.D. Version 2.2.2 Through Discrete Mathematics A Cool Brisk Walk / Chapter 1
"In the above example, the two sets contained different kinds of things: people, and drinks. But many relations are defined in which the left and right elements are actually drawn from the same set. Such a relation is called (don’t laugh) an endorelation. Consider the relation “hasACrushOn” between X and X, whose intensional meaning is that if (x, y) ∈ hasACrushOn, then in real life x is romantically attracted to y. The extension is probably only { (Ron, Hermione), (Hermione, Ron) }, although who knows what goes through teenagers’ minds. Another example would be the relation “hasMoreCaloriesThan” between Y and Y: this relation’s extension is { (Mt. Dew, Dr. Pepper) }. (Fun fact: Dr. Pepper has only 150 calories per can, whereas Mt. Dew has 170.)"
Related Ideas
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