2/ BARBER: What can I do for you?
MAN: f(x, y)=x²-y²
BARBER: Say no more.
2/ BARBER: What can I do for you?
MAN: f(x, y)=x²-y²
BARBER: Say no more.
3/ MAN: Do you do 2d haircuts here?
BARBER: Son, we do 3D haircuts if you can believe it.
MAN: Cool, cool.
The man slips him a piece of paper: f(x,y)=x²-y²
BARBER: …
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