A Note on Transitive Action of the Extended Modular Group on Rational Numbers

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Fundamentals of Contemporary Mathematical Sciences
Volume:3 Issue:2
A Note on Transitive Action of the Extended Modular Group on Rational Numbers

A Note on Transitive Action of the Extended Modular Group on Rational Numbers

Authors : Bilal DEMİR

Pages : 160-171

Doi:10.54974/fcmathsci.1082199

View : 14 | Download : 10

Publication Date : 2022-07-28

Article Type : Research Paper

Abstract :The extended modular group $\overline{\Gamma}$ is isomorphic to the amalgamated free product of two dihedral groups $D_2$ and $D_3$ with amalgamation $\mathbb{Z}_2$. This group acts on rational numbers transitively. In this study, we obtain elements in the extended modular group that are mappings between given two rationals. Also, we express these elements as a word in generators. We use interesting relations between continued fractions and the Farey graph.
Keywords : Extended modular group, continued fractions, Farey graph

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