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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.
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."