Bifalgorithm post · Brisk · Chapter 1

What are examples of different relations on the same two sets?

What are examples of different relations on the same two sets? (Brisk · Chapter 1) — "We can of course define other relations on the same two sets. Let’s defin…

Ideas in this flowchart

  • Définir plusieurs relations sur les mêmes deux ensembles
  • La relation « likes » indique les boissons que chaque personne apprécie
  • Extension de « likes » : {(Harry, Dr. Pepper), (Ron, Dr. Pepper), (Hermione, Dr. Pepper), (Hermione, Mt. Dew)}
  • Tout le monde aime Dr. Pepper
  • Hermione a des goûts plus larges et aime aussi Mt. Dew
  • La relation « hasFaveDrink » indique la boisson préférée de chaque personne
  • Extension de « hasFaveDrink » : {(Harry, Dr. Pepper), (Ron, Dr. Pepper)}
  • Hermione n’apparaît pas dans cette relation, peut-être parce qu’elle préfère le thé glacé
  • La relation « ownsStockIn » indique les personnes qui possèdent des actions de sociétés de boissons
  • Extension de « ownsStockIn » : ∅
  • Les membres de X sont trop occupés à étudier les potions pour posséder des actions
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What are examples of different relations on the same two sets?

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Brisk

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"We can of course define other relations on the same two sets. Let’s define a relation “likes” to contain { (Harry, Dr. Pepper), (Ron, Dr. Pepper), (Hermione, Dr. Pepper), (Hermione, Mt. Dew) }. This states that while everybody likes Dr. Pepper, Hermione herself has broad tastes and also likes Mt. Dew. Another relation, “hasFaveDrink,” might indicate which drink is each person’s favorite. Maybe the extension is { (Harry, Dr. Pepper), (Ron, Dr. Pepper) }. There’s no ordered pair with Hermione in it, perhaps because she actually prefers iced tea. Yet another relation, “ownsStockIn,” represents which people own stock in which beverage companies. In this case, ownsStockIn = ∅ since all of the members of X are too busy studying potions to be stock owners in anything."

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