X marks the unknown in algebra – but X's origins are a math mystery

How did the letter x get its enduring role as a symbol of the unknown? A mathematician explains why it’s hard to say for sure.

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X Marks The Unknown In Algebra – But X's Origins Are A Math Mystery

X marks the unknown in algebra – but X's origins are a math mystery

PDF) Unknown, placeholder, or variable: What is x?

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From the 1970s Onward: The Rise of Braid Monodromy Factorization

Scissors congruence,' an ancient geometric idea that's still