Every periodic continued fraction is the continued fraction expansion of a real quadratic irrational number.
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Or "quadratic surd", as the quaint phrase goes. "The square root of two is not a fraction? That's absurd!" "No - it's a surd!"
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Or "quadratic surd", as the quaint phrase goes. "The square root of two is not a fraction? That's absurd!" "No - it's a surd!"
