Christmas cracker joke III

Behind today’s door… A joke!

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This post was part of the Chalkdust 2016 Advent Calendar.

                                                            ???

What do mathematicians say after Christmas dinner?

???

$\sqrt{\frac{-1}{64}}$

Atheeta is a PhD student at UCL in the area of mathematical ecology. He also has interests in evolutionary game theory and social dynamics.

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