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  @ZachWeinersmith You might find An Imaginary Tale (Paul Nahin) interesting - a very detailed account of the history of √-1. An unusual combination of history book and maths textbook. https://press.princeton.edu/books/paperback/9780691169248/an-imaginary-tale

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  A book in PDF form is still a book, right? And an adventure game you play with a computer is obviously a video game. I have in my posession a PDF of a choose-your-own adventure book. The "go to page X" instructions are clickable. Is it a book or a video game? (You're not allowed "both".)