So if you ever meet someone using this letter while doing math, then learn as much as you can by quietly observing them, before they return to their home planet. In the title text the idea that any one using Ξ must be aliens is made clear. In the main comic those using Ξ (capital xi) greets us as Earth mathematicians, indicating they are not from Earth, but have come here to learn what we know of math. In the title text the joke about capital Xi from the main comic is continued. This comic gives a (non-)explanation of what they typically mean, see below. Mathematics uses lots of Greek letters, typically using the same letter consistently to represent a particular constant or type of variable. Title text: If you ever see someone using a capital xi in an equation, just observe them quietly to learn as much as you can before they return to their home planet.
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