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All maths papers are like this
Disciplines in mathematics assume you're familiar with that discipline's shorthand, constants and common forms. Also, you're not expected to read them as you're able to read a book. If it's 100% your niche specialty then maybe you could, but spending and hour or two puzzling out a broad understanding of a paper is absolutely normal, even for math academics.
They start by make sure you're primed to feel stupid if you don't understand it?
It can feel like that, though I'm sure it's (mostly) not deliberate. Also the sudden jump from straightforward to incomprehensible, accompanied by a comment from the author along the lines of "well duh"
Don't forget something like "As my book focuses on explaining concepts to normal people in simple manner, I will only include simple math."
Every Wikipedia page on a mathematical concept as well
