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Uniqueness theorem for biharmonic functions given in three-dimensional Euclidian space 𝑅3

https://doi.org/10.22405/2226-8383-2025-26-5-287-298

Abstract

This work is devoted to studying the properties of the method of the constructed function
𝜙𝜎(𝑦, 𝑥), which is defined in the infinite domain D of three-dimensional Euclidean space. In this
work, we prove results that allow us to assert the boundedness of a biharmonic function inside
a certain three-dimensional region if it is bounded with its normal derivative at the boundaries
of this region.

About the Authors

Zebiniso Rahimovna Ashurova
Uzbek-Finnish Pedagogical Institute
Uzbekistan

associate professor



Umidakhon Yunusalievna Jurayeva
Samarkand State University
Uzbekistan

doctoral student



Nodirakhon Yunusovna Jurayeva
Tashkent University of Information Technologies named after Mu-hammad al-Kharazmi
Uzbekistan

associate professor



Feruza Utkirjanovna Mallaeva
Samarkand State University
Uzbekistan

student,



References

1. Evgrafov, M.A. & Chegis, I.A. 1960, “Generalization of the Phragm´en-Lindelof type theorem for analytic functions to harmonic functions in space”, Doklady Akademii Nauk SSSR, vol. 134, pp. 252–262.

2. Chegis, I.A. 1961, “A Phragm´en-Lindelof type theorem for harmonic functions in a rectangular cylinder”, Doklady Akademii Nauk SSSR, vol. 141, pp. 556–559.

3. Arshon, I.S. & Evgrafov, M.A. 1962, “On the growth of functions harmonic in a cylinder and bounded on its surface together with the normal derivative”, Doklady Akademii Nauk SSSR, vol. 147, pp. 321–324.

4. Arshon, I.S. & Evgrafov, M.A. 1962, “Example of a harmonic function in the entire space bounded outside a circular cylinder”, Doklady Akademii Nauk SSSR, vol. 147, pp. 231–234.

5. Arshon, I.S. & Evgrafov, M.A. 1962, “On the growth of harmonic functions of three variables”, Doklady Akademii Nauk SSSR, vol. 147, pp. 347–351.

6. Leontiev, A.F. 1963, “On Phragm´en-Lindelof type theorems for harmonic functions in a cylinder”, Izvestiya Akademii Nauk SSSR. Seriya Matematicheskaya, vol. 27, pp. 661–676.

7. Yarmukhamedov, Sh.Ya. 2003, “The Cauchy problem for the polyharmonic equation”, Doklady Rossiiskoi Akademii Nauk, vol. 393, no. 2, pp. 162–165.

8. Ashurova, Z.R., Jurayeva, N.Yu. & Jurayeva, U.Yu. 2021, “On some properties of the Yarmukhamedov kernel”, International Journal of Innovative Research, vol. 10, no. 1, pp. 84–90.

9. Ashurova, Z.R., Jurayeva, N.Yu. & Jurayeva, U.Yu. 2020, “Growing polyharmonic functions and the Cauchy problem”, Journal of Critical Reviews, vol. 7, no. 6, pp. 371–378, doi: 10.31938/jcr.07.06.62.

10. Ashurova, Z.R., Jurayeva, N.Yu. & Jurayeva, U.Yu. 2020, “Task Cauchy and Carleman function”, Academicia: An International Multidisciplinary Research Journal, vol. 10, no. 6, pp. 371–378, [Online] Available at: http://saarj.com [Accessed 19 December 2024].

11. Goluzin, G.M. 1933, “The generalized Carleman formula and its application to analytic continuation of functions”, Matematicheskii Sbornik, vol. 40, no. 2, pp. 144–149.

12. Tikhonov, A.N. 1943, “On the stability of inverse problems”, Doklady Akademii Nauk SSSR, vol. 39, no. 5, pp. 195–198.

13. Lavrentyev, M.M. & Romanov, V.G. 1990, Ill-posed problems of mathematical physics and analysis, Nauka, Moscow.

14. Yarmukhamedov, Sh.Ya. 1985, “Green’s formula in an infinite domain and its application”, Doklady Akademii Nauk SSSR, vol. 284, no. 5, pp. 697–700.

15. Juraeva, N.Yu., Jurayeva, U.Yu. & Saidov, U.M. 2011, “The Carleman function for polyharmonic functions in some regions in m-dimensional even Euclidean space”, Uzbek Mathematical Journal, no. 3, pp. 64–68.

16. Juraeva, U.Yu. 2022, “Phragm´en-Lindelof type theorems for biharmonic functions”, Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika, no. 10, pp. 42–65, doi: 10.26907/0021-3446-2022-10-42-65.

17. Juraeva, U.Yu. 2024, “Phragm´en-Lindelof type theorems”, Differential Equations, vol. 60, no. 8, pp. 1063–1075, doi: 10.31857/S0374064124080059.

18. Juraeva, U.Yu. 2022, “The Phragmen-Lindelof type theorems”, Uzbek Mathematical Journal, vol. 66, no. 3, pp. 54–61, doi: 10.29229/uzmj.2022-3-7.


Review

For citations:


Ashurova Z.R., Jurayeva U.Yu., Jurayeva N.Yu., Mallaeva F.U. Uniqueness theorem for biharmonic functions given in three-dimensional Euclidian space 𝑅3. Chebyshevskii Sbornik. 2025;26(5):287-298. (In Russ.) https://doi.org/10.22405/2226-8383-2025-26-5-287-298

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ISSN 2226-8383 (Print)