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Group Structure of the \(p\)-Adic Ball and Dynamical System of Isometry on a Sphere

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Abstract

In this paper, the group structure of the \(p\)-adic ball and sphere are studied. The dynamical system of isometry defined on invariant sphere is investigated. We define the binary operations \(\oplus\) and \(\odot\) on a ball and sphere, respectively, and prove that these sets are compact topological abelian group with respect to the operations. Then we show that any two balls (spheres) with positive radius are isomorphic as groups. We prove that the Haar measure introduced in \(\mathbb Z_p\) is also a Haar measure on an arbitrary balls and spheres. We study the dynamical system generated by the isometry defined on a sphere and show that the trajectory of any initial point that is not a fixed point is not convergent. We study ergodicity of this \(p\)-adic dynamical system with respect to normalized Haar measure reduced on the sphere. For \(p\geq 3\) we prove that the dynamical systems are not ergodic. But for \(p=2\) under some conditions the dynamical system may be ergodic.

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Acknowledgments

The author would like to thank Professors U. A. Rozikov and O. N. Khakimov for intensive discussions.

Funding

This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.

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Authors and Affiliations

  1. Namangan State University, 316, Uychi Str., Namangan, 160100, Uzbekistan

    I. A. Sattarov

  2. Institute ofMathematics, 9, University Str., Tashkent, 100174, Uzbekistan

    I. A. Sattarov

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  1. I. A. Sattarov
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Sattarov, I.A. Group Structure of the \(p\)-Adic Ball and Dynamical System of Isometry on a Sphere. P-Adic Num Ultrametr Anal Appl 16, 128–135 (2024). https://doi.org/10.1134/S2070046624020031

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