We are in the midst of an onslaught of books devoted to particular numbers. In this article we will be concerned with several recent and not-so-recent books about pi, e, i, and 0; of the quantities in the famous equation e(pi)i + 1 = 0, only 1 does not yet have its book. Given the trend, we can look forward to its appearance, possibly followed by volumes on "+" and "=".
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