Everytime I look at something written in mathematical notation I can prevent myself from thinking "this is exactly what we do NOT want to do in programming: one letter variable, super super dense code, no comments, symbols/infix operators instead of obvious functions names"
And the result speak for itself : you need to **study math** things to understand it.
We you need to do that for programming you are just reading shitty code not meant to be share with humans.
Math is just shitty code.