Someone told me this, but I dont get it. $$\Gamma (Happy Birthday + 1)$$ Why is this the way to greet a mathematician on his birthday with an excitement?
2026-04-25 18:22:45.1777141365
How to greet a mathematician on his birthday with an excitement
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1
The joke is that
$$\Gamma(n + 1) = n!$$
is the factorial function. So
$$\Gamma(\text{Happy Birthday} + 1) = \text{Happy Birthday}!$$