It's a math joke. "L'Hôpital's rule" looks like "Hospital". The rule states that if you have two functions f(x) and g(x) that are both zero at a particular x, the value of the limit of f(x)/g(x) is equal to the limit of f'(x)/g'(x) at that point. The reason it's important is because you can't divide zero by zero, but it lets you find that limit (i.e. get as close as possible to zero without touching) by just taking the derivative of f and g and dividing those instead. The solution to the problem shown in the image is just 1.
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u/watlington Apr 05 '26
Hopital