this post was submitted on 24 Jul 2023
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And for those wondering, it's a "mathematical double-struck capital x".
I kinda wonder what makes it "mathematical"
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
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.
Probably used in vector notation and gauge fields