Maximum modulus of slice entire regular functions of quaternionic variable with bounded index

Authors

DOI:

https://doi.org/10.64700/altay.8

Keywords:

slice entire function, bounded index, maximum modulus, local behavior

Abstract

 The manuscript contains new results describing local behavior of slice entire regular functions of quaternionic variable. There is selected such their subclass as functions having bounded index and for these functions we describe uniform estimate of their maximum modulus in a disc of larger radius by their maximum modulus in a disc of lesser radius multiplied on some constant. 

References

[1] V. Baksa, A. Bandura and O. Skaskiv: Slice entire functions of quaternionic variable of bounded index, Ukr. Mat. Zh., 77 (5) (2025), 295–303.

[2] V. P. Baksa, A.I. Bandura: On an attempt to introduce a notion of bounded index for the Fueter regular functions of the quaternionic variable. Mat. Stud., 60 (2) (2023), 191–200.

[3] V. Baksa, A. Bandura and O. Skaskiv: Analogs of Hayman’s Theorem and of logarithmic criterion for analytic vectorvalued functions in the unit ball having bounded L-index in joint variables, Math. Slovaca, 70 (5) (2020), 1141–1152.

[4] V. P. Baksa, A. I. Bandura, T. M. Salo and O. B. Skaskiv: Note on boundedness of the L-index in the direction of the composition of slice entire functions, Mat. Stud., 58 (1) (2022), 58–68.

[5] V. Baksa, A. Bandura and O. Skaskiv: Uniform estimates of maximum modulus of slice entire regular function with bounded index, InternationalWorkshop on Modern Problems of Analysis, Optimization, Approximation and Their Applications, Book of Proceedings. 25th, 26-27 June, 2025. Rome, Italy, 5–6.

[6] A. Bandura, N. Petrechko and O. Skaskiv: Maximum modulus in a bidisc of analytic functions of bounded L-index and an analogue of Hayman’s theorem, Math. Bohemica, 143 (4) (2018), 339–354.

[7] A. I. Bandura: Some improvements of criteria of L-index boundedness in direction, Mat. Stud., 47 (1) (2017), 27–32.

[8] A. I. Bandura, T. M. Salo and O. B. Skaskiv: Slice holomorphic functions in the unit ball: boundedness of L-index in a direction and related properties, Mat. Stud., 57 (1) (2022), 68–78.

[9] A. Bandura, T. Salo and O. Skaskiv: L-index in joint variables: sum and composition of an entire function with a function with a vanished gradient, Fractal and Fractional, 7 (8) (2023), Article ID: 593.

[10] A. Bandura, T. Salo: Analytic in a unit polydisc functions of bounded L-index in direction, Mat. Stud., 60 (1) (2023), 55–78.

[11] A. I. Bandura: Application of Hayman’s theorem to directional differential equations with analytic solutions in the unit ball, Stud. Univ. Babes-Bolyai Math., 69 (2) (2024), 335–350.

[12] A. Bandura, T. Salo and O. Skaskiv: Non-homogeneous directional equations: slice solutions belonging to functions of bounded L-index in the unit ball, Math. Bohemica, 149 (2) (2024), 247–260.

[13] F. Colombo, I. Sabadini and D. C. Struppa: Entire slice regular functions, Springer, Cham (2016).

[14] F. Colombo, I. Sabadini, F. Sommen and D. C. Struppa: Analysis of Dirac systems and computational algebra, Springer Science + Business Media LLC, New York (2004).

[15] F. Colombo, J. Gantner and D. P. Kimsey: Slice hyperholomorphic functions, Oper. Theory Adv. Appl., 270 (2018), 11–51.

[16] G. Gentili, D. C. Struppa: A new theory of regular functions of a quaternionic variable, Adv. Math., 216 (2007), 279–301.

[17] J. O. González-Cervantes, L. G. Núñez-Olmedo and J. Bory-Reyes, I. Sabadini: An approach to slice regular functions via post-quantum calculus theory, Math. Methods Appl. Sci., 47 (18) (2024), 14216–14230.

[18] T. Kuzmenko, V. Shpakivskyi: Representations of some classes of quaternionic hyperholomorphic functions, Complex Anal. Oper. Theory, 18 (5) (2024), Article ID: 116.

[19] S. Plaksa: Monogenic functions and harmonic vectors, Proceedings of the International Geometry Center, 16 (1) (2023), 59–76.

[20] S. A. Plaksa, V. S. Shpakivskyi: Monogenic Functions in Spaces with Commutative Multiplication and Applications, Frontiers in Mathematics, Birkhäuser, Cham, Switzerland (2023).

[21] O. B. Skaskiv: Progress in the open problems of functions of bounded index, Mat. Stud., 49 (1) (2018), 109–112.

[22] M. Sheremeta: On boundedness of the l − m-index of entire functions represented by series in a system of functions, Ukr. Math. J., 76 (2024), 669–679.

[23] M. M. Sheremeta, Y. S. Trukhan: Properties of analytic solutions of three similar differential equations of the second order, Carp. Math. Publ., 13 (2) (2021), 413–425.

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Published

2025-11-07

How to Cite

Baksa, V., Bandura, A., & Skaskiv, O. (2025). Maximum modulus of slice entire regular functions of quaternionic variable with bounded index. Altay Conference Proceedings in Mathematics, 2(1), 32–39. https://doi.org/10.64700/altay.8

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Section

Issue: IWMPAOATA

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