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Simple math rule
(sh.itjust.works)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
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."