I think this might be the most visually perfect mathematical expression:

Aaah, LaTeX. It's been too long. I'll never stop being amazed at just how good everything looks in it.

Aaah, LaTeX. It's been too long. I'll never stop being amazed at just how good everything looks in it.
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At some point, I realized that LaTeX looked so good, because my definition of "good" was based on Big Important Papers that used LaTeX. That made me happy. :)