What is the definition of Paperbacks Math?

"A paperback math book is like a clumsy mathematician with a stack of crumpled paper in front of them - it's trying to teach you the art of calculus, but its handwriting is so shaky, it's almost comical."

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Now, here's a sentence that might make your skin crawl with the unsettling twist of literary horror: "The paperback math on my knees was so grim that I wondered if it had been written by a grumpy old librarian who once tried to teach me how to juggle equations."