# Predicate Logic and Popular Culture (Part 13): Safety Dance

Let $F(x,y)$ be the proposition “$x$ and $y$ are friends,” and let $D(x)$ be the proposition “$x$ dances.” Translate the logical statement

$\forall x (F(\hbox{you},x) \Longrightarrow \lnot D(x)) \land \forall x (\lnot D(x) \Longrightarrow \lnot F(\hbox{I},x))$,

where the domain is all people.

The straightforward way of translating this into English is, “All of your friends do not dance, and anyone who doesn’t dance is not my friend.” But it’s much more catchy when sung with syntho-pop music to one of the great one-hit wonders of the 1980s.

Context: This semester, I taught discrete mathematics for the first time. Part of the discrete mathematics course includes an introduction to predicate and propositional logic for our math majors. As you can probably guess from their names, students tend to think these concepts are dry and uninteresting even though they’re very important for their development as math majors.

In an effort to making these topics more appealing, I spent a few days mining the depths of popular culture in a (likely futile) attempt to make these ideas more interesting to my students. In this series, I’d like to share what I found. Naturally, the sources that I found have varying levels of complexity, which is appropriate for students who are first learning prepositional and predicate logic.

When I actually presented these in class, I either presented the logical statement and had my class guess the statement in actual English, or I gave my students the famous quote and them translate it into predicate logic. However, for the purposes of this series, I’ll just present the statement in predicate logic first.

## One thought on “Predicate Logic and Popular Culture (Part 13): Safety Dance”

This site uses Akismet to reduce spam. Learn how your comment data is processed.