Report of Meeting: The Twenty-fifth Katowice–Debrecen Winter Seminar on Functional Equations and Inequalities Kościelisko-Zakopane, Poland, February 3–6, 2026
By: Maciej Sablik
References
- K. Baron, On some linear functional equations with continuous solutions, Aequationes Math. 99 (2025), no. 6, 2689–2698.
- W. Jarczyk, A category theorem for linear functional equations in the indeterminate case, Bull. Acad. Polon. Sci. Sér. Sci. Math. 29 (1981), no. 7–8, 371–372.
- W. Jarczyk, On a set of functional equations having continuous solutions, Glasnik Mat. Ser. III 17(37) (1982), no. 1, 59–64.
- W. Jarczyk, On linear functional equations in the determinate case, Glasnik Mat. Ser. III 18(38) (1983), no. 1, 91–102.
- J. Chmieliński and R. Stypka, Additive operators approximately preserving Birkhoff–James orthogonality, Aequationes Math. 99 (2025), no. 6, 2847–2854.
- M. Lewandowski, Buying and selling price for risky lotteries and expected utility theory with gambling wealth, J. Risk Uncertain. 48 (2014), no. 3, 253–283.
- B. Fazekas and I. Fazekas, Convergence of sequences of ordered selections, preprint.
- J. Aczél, 5. Remark, in: Report of meeting. The Forty-second International Symposium on Functional Equations, June 20–27, 2004, Opava, Czech Republic, Aequationes Math. 69 (2005), no. 1–2, p. 183.
- D. Bugajewski, A. Galimberti, and P. Maćkowiak, On composition and Right Distributive Law for formal power series of multiple variables, Aequationes Math. 99 (2025), no. 1, 21–35.
- X.-X. Gan, A generalized chain rule for formal power series, Commun. Math. Anal. 2 (2007), no. 1, 37–44.
- X.-X. Gan and D. Bugajewski, A note on formal power series, Comment. Math. Univ. Carolin. 51 (2010), no. 4, 595–604.
- X.-X. Gan and N. Knox, On composition of formal power series, Int. J. Math. Math. Sci. 30 (2002), no. 12, 761–770.
- J. Aczél and J. Dhombres, Functional Equations in Several Variables, Encyclopedia Math. Appl., 31, Cambridge University Press, Cambridge, 1989.
- P. Burai, G. Kiss, and P. Szokol, Characterization of quasi-arithmetic means without regularity condition, Acta Math. Hungar. 165 (2021), no. 2, 474–485.
- P. Burai, G. Kiss, and P. Szokol, A dichotomy result for strictly increasing bisymmetric maps, J. Math. Anal. Appl. 526 (2023), no. 2, Paper No. 127269, 9 pp.
- G. Kiss, On noncontinuous bisymmetric strictly monotone operations, submitted, 2026. Available at arXiv:2601.16247v2.
- D. Głazowska and J. Matkowski, Weakly associative functions, Aequationes Math. 99 (2025), no. 4, 1827–1841.
- W. Jarczyk, On continuous functions which are additive on their graphs, Ber. Math.-Statist. Sekt. Forschungsgesellsch. Joanneum, 292, Graz, 1988.
- W. Jarczyk, A recurrent method of solving iterative functional equations, Prace Nauk. Uniw. Śląsk. Katowic., 1206, Uniwersytet Śląski, Katowice, 1991.
- T. Kiss, A counterexample to Matkowski's conjecture for quasi graph-additive functions, Aequationes Math. 100 (2026), no. 2, Paper No. 27, 8 pp.
- J. Matkowski, Weakly associative functions and means - new examples and open questions, Aequationes Math. 99 (2025), no. 6, 2581–2597.
- A. Epebinu and R. Łukasik, Generalized orthogonality equations in normed spaces, Aequationes Math. 100 (2026), no. 1, Paper No. 5, 10 pp.
- A.R. Baias, D. Otrocol, and M. Rus, Report of Meeting. The 61st International Symposium on Functional Equations, Cluj-Napoca (Romania), June 15–21, 2025, Aequationes Math. 99 (2025), no. 5, 2457–2479. DOI: 10.1007/s00010-025-01236-8.
- P. Pasteczka, On the invariance equation for means of generalized power growth, Math. Inequal. Appl. 27 (2024), no. 3, 691–702.
- A. Witkowski, On invariance equation for means of power growth, Math. Inequal. Appl. 17 (2014), no. 3, 1091–1094.
- F. Bellini, R.J.A. Laeven, and E. Rosazza Gianin, Robust return risk measures, Math. Financ. Econ. 12 (2018), no. 1, 5–32.
- J. Chmieliński and R. Stypka, Additive operators approximately preserving Birkhoff-James orthogonality, Aequationes Math. 99 (2025), no. 6, 2847–2854.
- C. de Boor and A. Pinkus, Proof of the conjectures of Bernstein and Erdős concerning the optimal nodes for polynomial interpolation, J. Approx. Theory 24 (1978), no. 4, 289–303.
- T.A. Kilgore, A characterization of the Lagrange interpolating projection with minimal Tchebycheff norm, J. Approx. Theory 24 (1978), no. 4, 273–288.
- Zs. Páles and A. Zakaria, On the equality problem of two-variable Bajraktarević means under first-order differentiability assumptions, Aequationes Math. 97 (2023), no. 2, 279–294.
- Zs. Páles and A. Zakaria, On the equality of generalized Bajraktarević means under first-order differentiability assumptions, Aequationes Math. 99 (2025), no. 6, 2485–2503.
- S.M. Enderami, M. Abtahi, A. Zamani, and P. Wójcik, An orthogonality relation in complex normed spaces based on norm derivatives, Linear Multilinear Algebra 72 (2024), no. 4, 687–705.
- A.D. Epebinu, T. Szostok, Inequalities for fractional integral with the use of stochastic orderings, Appl. Math. Comput. 466 (2024), Paper No. 128481, 12 pp.
- A. Lisak, M. Sablik, Trapezoidal rule revisited, Bull. Inst. Math. Acad. Sin. (NS) 6 (2011), no. 3, 347–360.
- M.Z. Sarikaya, E. Set, H. Yaldiz, and N. Başak, Hermite-Hadamard's inequalities for fractional integrals and related fractional inequalities, Math. Comput. Modelling 57 (2013), no. 9–10, 2403–2407.
T
omasz Szostok
Language: English
Page range: 302 - 319
Submitted on: Feb 23, 2026
Accepted on: Apr 13, 2026
Published on: Jun 30, 2026
In partnership with: Paradigm Publishing Services
Related subjects:
© 2026 , published by University of Silesia in Katowice, Institute of Mathematics
This work is licensed under the Creative Commons Attribution 4.0 License.