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- W4296762753 abstract "Rational approximations to a square root $sqrt{k}$ can be produced by iterating the transformation $f(x) = (dx+k)/(x+d)$ starting from $infty$ for any positive integer $d$. We show that these approximations coincide infinitely often with continued fraction convergents if and only if $4d^2/(k-d^2)$ is an integer, in which case the continued fraction has a rich structure. It consists of the concatenation of the continued fractions of certain explicitly definable rational numbers, and it belongs to one of infinitely many families of continued fractions whose terms vary linearly in two parameters. We also give conditions under which the orbit ${f^n(infty)}$ consists exclusively of convergents or semiconvergents and prove that with few exceptions it includes all solutions $p/q$ to the Pell equation $p^2 - k q^2 = pm 1$." @default.
- W4296762753 created "2022-09-23" @default.
- W4296762753 creator A5037063143 @default.
- W4296762753 date "2014-09-23" @default.
- W4296762753 modified "2023-09-27" @default.
- W4296762753 title "Continued Fractions and Linear Fractional Transformations" @default.
- W4296762753 doi "https://doi.org/10.48550/arxiv.1409.6674" @default.
- W4296762753 hasPublicationYear "2014" @default.
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