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.
Origin:https://xkcd.com/2586/
https://www.explainxkcd.com/wiki/index.php/2586:_Greek_Letters
希腊字母

http://xkcd.in/comic?lg=cn&id=2586
数学使用大量希腊字母,通常一致地使用相同的字母来表示特定的常数或变… Read more