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Description
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Suspenders for her socks? In that case, the word you’re looking for is “garters”. ‘3’
Twilight that is
Anyone else wanting Twilight to read out aloud?
It’s one of the basic functions that defines how the integral operation works in calculus math. (See the third equation on this page: https://en.wikipedia.org/wiki/Integral) I don’t think there is any special meaning in this context, other than to show Twilight as a geek.