Ford circles, continued fractions, and best approximation of the second kind

Ford circles, continued fractions, and best approximation of the second kind

Ian Short
arXiv 2009
18
short2009ford

Abstract

We give an elementary geometric proof using Ford circles that the convergents of the continued fraction expansion of a real number $\alpha$ coincide with the rationals that are best approximations of the second kind of $\alpha$.

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