this post was submitted on 24 Jul 2023
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It's so generic, the logo is literally on Unicode.
Don't believe me? I can just type π out like this.. What's worse is that Google and YouTube and Wikipedia all pretend that it's just a regular X.
And for those wondering, it's a "mathematical double-struck capital x".
I kinda wonder what makes it "mathematical"
The fancy line that barely distinguishes it from any other X, capital or not or maybe with a wiggly line, so you get extra confused in your proof on line 13 or something.
In set theory, this style, blackboard bold is used to represent "special sets", for example the set of all integers
Now I remember exactly what you mean
Probably used in vector notation and gauge fields