#mathematics  

Jake: Why do we have two Theorem 1.12's?
Dr. Vaughan: Because I can't count. You should see me trying to calculate a tip at a restaurant.
Jake: You just divide by 6.
Dr. Vaughan: But that's too hard to do!
Jake: But you're a number theorist!
Dr. Vaughan: That's precisely correct. I know the theory of dividing by 6.

http://www.personal.psu.edu/rcv4/568Quotations.pdf
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