#3213: Dental Formulas

XKCD comic, described below.
Transcript
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[Cueball and Megan are standing in front of a whiteboard, on which is written

3.1.3.1
3.1.2.1

along with a drawing of a tooth and some other scribbles.]

Cueball: Do mammologists think these are hard?

Cueball: I mean this one just evaluates to 3/2.

[Caption below the panel:]

Mathematicians encounter dental formulas


(Sourced from explainxkcd.com)

I mean, half of these are undefined. And your multiplication dots are too low; they look like decimal points.

ExplainOriginal