The Letter 'X' Stands for the Unknown, the Mysterious, and the
From Twitter's rebranding to The X-Files to algebra, this single letter has an uncommon amount ofX factor. A historian of mathematics gets to the root of it.
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Akhenaten to the Founding Fathers: The Mysteries of the Hooked X: Wolter, Scott F.: 9780878396207: : Books
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X marks the unknown in algebra – but X's origins are a math mystery
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X marks the unknown in algebra – but X's origins are a math mystery