Sablik, Maciej; Shulman, Ekaterina Exponential rationals. (English) Zbl 07783605 Result. Math. 79, No. 1, Paper No. 35, 11 p. (2024). Reviewer: László Losonczi (Debrecen) MSC: 39B22 PDFBibTeX XMLCite \textit{M. Sablik} and \textit{E. Shulman}, Result. Math. 79, No. 1, Paper No. 35, 11 p. (2024; Zbl 07783605) Full Text: DOI OA License
Robinson, P. L. Generalized sines and duplication formulae. (English) Zbl 07758998 J. Math. Anal. Appl. 530, No. 1, Article ID 127624, 13 p. (2024). MSC: 33E05 33B10 39B22 PDFBibTeX XMLCite \textit{P. L. Robinson}, J. Math. Anal. Appl. 530, No. 1, Article ID 127624, 13 p. (2024; Zbl 07758998) Full Text: DOI
Gselmann, Eszter; Doble, Christopher W.; Hsu, Yung-Fong On Iverson’s law of similarity. arXiv:2402.07670 Preprint, arXiv:2402.07670 [math.CA] (2024). MSC: 91E30 39B22 BibTeX Cite \textit{E. Gselmann} et al., ``On Iverson's law of similarity'', Preprint, arXiv:2402.07670 [math.CA] (2024) Full Text: arXiv OA License
Glasovits, Tamás; Házy, Attila; Túri, József A Hosszú type functional equation with operation \(x \circ y = (x^{1/c}+y^{1/c})^c\). (English) Zbl 07822969 Ann. Math. Inform. 59, 27-36 (2023). MSC: 39B22 PDFBibTeX XMLCite \textit{T. Glasovits} et al., Ann. Math. Inform. 59, 27--36 (2023; Zbl 07822969) Full Text: DOI
Glasovits, Tamás Short remark to the Rimán’s Theorem. (English) Zbl 07822968 Ann. Math. Inform. 59, 13-26 (2023). MSC: 39B22 PDFBibTeX XMLCite \textit{T. Glasovits}, Ann. Math. Inform. 59, 13--26 (2023; Zbl 07822968) Full Text: DOI
Akhtamova, S. S.; Alekseev, V. S.; Lyapin, A. P. Discrete generating functions. (English. Russian original) Zbl 07820480 Math. Notes 114, No. 6, 1087-1093 (2023); translation from Prikl. Mat. Fiz. 55, No. 2, 89-95 (2023). MSC: 39B22 39A06 39A70 33C20 PDFBibTeX XMLCite \textit{S. S. Akhtamova} et al., Math. Notes 114, No. 6, 1087--1093 (2023; Zbl 07820480); translation from Prikl. Mat. Fiz. 55, No. 2, 89--95 (2023) Full Text: DOI
Bae, Jae-Hyeong; Park, Won-Gil Approximate multi-variable bi-Jensen-type mappings. (English) Zbl 07794644 Demonstr. Math. 56, Article ID 20230105, 8 p. (2023). Reviewer: Jacek Chmieliński (Kraków) MSC: 39B82 39B22 PDFBibTeX XMLCite \textit{J.-H. Bae} and \textit{W.-G. Park}, Demonstr. Math. 56, Article ID 20230105, 8 p. (2023; Zbl 07794644) Full Text: DOI OA License
Kim, Gwang Hui On the superstability for the \(p\)-power-radical sine functional equation. (English) Zbl 07789919 Nonlinear Funct. Anal. Appl. 28, No. 3, 801-812 (2023). MSC: 39B82 39B22 39B52 PDFBibTeX XMLCite \textit{G. H. Kim}, Nonlinear Funct. Anal. Appl. 28, No. 3, 801--812 (2023; Zbl 07789919) Full Text: Link
Lee, Yang-Hi; Jung, Soon-Mo A fixed point approach to the stability of a general quintic functional equation. (English) Zbl 07789911 Nonlinear Funct. Anal. Appl. 28, No. 3, 671-684 (2023). MSC: 39B82 39B22 47H10 PDFBibTeX XMLCite \textit{Y.-H. Lee} and \textit{S.-M. Jung}, Nonlinear Funct. Anal. Appl. 28, No. 3, 671--684 (2023; Zbl 07789911) Full Text: Link
Serbenyuk, Symon A certain modification of classical singular function. (English) Zbl 07785678 Bol. Soc. Mat. Mex., III. Ser. 29, No. 3, Paper No. 88, 14 p. (2023). MSC: 11K55 11J72 26A27 11B34 39B22 39B72 26A30 11B34 PDFBibTeX XMLCite \textit{S. Serbenyuk}, Bol. Soc. Mat. Mex., III. Ser. 29, No. 3, Paper No. 88, 14 p. (2023; Zbl 07785678) Full Text: DOI
Ger, Roman Basic sets for some basic functional equations. (English) Zbl 07784713 Aequationes Math. 97, No. 5-6, 1221-1230 (2023). Reviewer: Eszter Gselmann (Debrecen) MSC: 39B22 39B55 PDFBibTeX XMLCite \textit{R. Ger}, Aequationes Math. 97, No. 5--6, 1221--1230 (2023; Zbl 07784713) Full Text: DOI OA License
Gilányi, Attila; To, Lan Nhi Computer assisted investigation of alienness of linear functional equations. (English) Zbl 07784711 Aequationes Math. 97, No. 5-6, 1185-1199 (2023). MSC: 39-04 39B22 39B52 65Q20 PDFBibTeX XMLCite \textit{A. Gilányi} and \textit{L. N. To}, Aequationes Math. 97, No. 5--6, 1185--1199 (2023; Zbl 07784711) Full Text: DOI OA License
Járai, Antal On the state of the second part of Hilbert’s fifth problem. (English) Zbl 07784710 Aequationes Math. 97, No. 5-6, 1173-1184 (2023). Reviewer: Gian Luigi Forti (Milano) MSC: 39B05 39B22 26B05 28C15 PDFBibTeX XMLCite \textit{A. Járai}, Aequationes Math. 97, No. 5--6, 1173--1184 (2023; Zbl 07784710) Full Text: DOI OA License
Boros, Zoltán; Garda-Mátyás, Edit Quadratic functions fulfilling an additional condition along the hyperbola \(xy = 1 \). (English) Zbl 07784708 Aequationes Math. 97, No. 5-6, 1141-1155 (2023). MSC: 39B55 39B22 PDFBibTeX XMLCite \textit{Z. Boros} and \textit{E. Garda-Mátyás}, Aequationes Math. 97, No. 5--6, 1141--1155 (2023; Zbl 07784708) Full Text: DOI OA License
Szostok, Tomasz On quadrature means. (English) Zbl 07784695 Aequationes Math. 97, No. 5-6, 935-949 (2023). MSC: 26E60 26A51 26D10 39B22 39B62 PDFBibTeX XMLCite \textit{T. Szostok}, Aequationes Math. 97, No. 5--6, 935--949 (2023; Zbl 07784695) Full Text: DOI OA License
Almira, J. M. Using Aichinger’s equation to characterize polynomial functions. (English) Zbl 07784692 Aequationes Math. 97, No. 5-6, 899-907 (2023). Reviewer: Gian Luigi Forti (Milano) MSC: 39B52 39B22 39B32 PDFBibTeX XMLCite \textit{J. M. Almira}, Aequationes Math. 97, No. 5--6, 899--907 (2023; Zbl 07784692) Full Text: DOI arXiv OA License
Beg, Ismat Core of a convex mixture set and convex functions. (English) Zbl 07781235 Gulf J. Math. 15, No. 2, 15-24 (2023). MSC: 26B25 52A05 39B22 52A35 91A44 PDFBibTeX XMLCite \textit{I. Beg}, Gulf J. Math. 15, No. 2, 15--24 (2023; Zbl 07781235) Full Text: DOI
Turab, Ali; Sintunavarat, Wutiphol On the solution of the generalized functional equation arising in mathematical psychology and theory of learning approached by the Banach fixed point theorem. (English) Zbl 07752900 Carpathian J. Math. 39, No. 2, 541-551 (2023). MSC: 39B22 47H10 03C45 PDFBibTeX XMLCite \textit{A. Turab} and \textit{W. Sintunavarat}, Carpathian J. Math. 39, No. 2, 541--551 (2023; Zbl 07752900) Full Text: DOI
Gobbino, Massimo; Picenni, Nicola A quantitative variational analysis of the staircasing phenomenon for a second order regularization of the Perona-Malik functional. (English) Zbl 1521.49011 Trans. Am. Math. Soc. 376, No. 8, 5307-5375 (2023). Reviewer: Alain Brillard (Riedisheim) MSC: 49J45 35B25 49Q20 39B22 PDFBibTeX XMLCite \textit{M. Gobbino} and \textit{N. Picenni}, Trans. Am. Math. Soc. 376, No. 8, 5307--5375 (2023; Zbl 1521.49011) Full Text: DOI arXiv
Dyachenko, Alexander; Karp, Dmitrii Trigonometric identities: from Hermite via Meijer, Nørlund, and Braaksma to Chu and Johnson and beyond. (English) Zbl 07730199 Bol. Soc. Mat. Mex., III. Ser. 29, No. 2, Paper No. 55, 31 p. (2023). Reviewer: Adhemar Bultheel (Leuven) MSC: 33B10 33E12 39B22 41A05 42A15 PDFBibTeX XMLCite \textit{A. Dyachenko} and \textit{D. Karp}, Bol. Soc. Mat. Mex., III. Ser. 29, No. 2, Paper No. 55, 31 p. (2023; Zbl 07730199) Full Text: DOI arXiv
Hooshmand, M. H. Remarks on the functional equation \(f(x+1) = g(x)f(x)\) and a uniqueness theorem for the gamma function. (English) Zbl 1522.39016 Indian J. Pure Appl. Math. 54, No. 3, 697-702 (2023). Reviewer: László Losonczi (Debrecen) MSC: 39B22 26A51 40A30 33B15 PDFBibTeX XMLCite \textit{M. H. Hooshmand}, Indian J. Pure Appl. Math. 54, No. 3, 697--702 (2023; Zbl 1522.39016) Full Text: DOI arXiv
Dăianu, Dan M. Iterative fixed point techniques in generalized Ulam stability. (English) Zbl 07726205 Result. Math. 78, No. 5, Paper No. 199, 17 p. (2023). MSC: 47H10 39A30 39B52 39B22 PDFBibTeX XMLCite \textit{D. M. Dăianu}, Result. Math. 78, No. 5, Paper No. 199, 17 p. (2023; Zbl 07726205) Full Text: DOI
Dil’man, Valeriĭ Leĭzerovich; Komissarova, Dar’ya Amirovna Linear functional equations in the class of antiderivatives from the Lebesgue functions on curves segments. (Russian. English summary) Zbl 1522.39015 Chelyabinskiĭ Fiz.-Mat. Zh. 8, No. 1, 5-17 (2023). MSC: 39B22 26A16 47H10 PDFBibTeX XMLCite \textit{V. L. Dil'man} and \textit{D. A. Komissarova}, Chelyabinskiĭ Fiz.-Mat. Zh. 8, No. 1, 5--17 (2023; Zbl 1522.39015) Full Text: DOI MNR
Turab, Ali; Rosli, Norhayati; Ali, Wajahat; Nieto, Juan J. The existence and uniqueness of solutions to a functional equation arising in psychological learning theory. (English) Zbl 07720272 Demonstr. Math. 56, Article ID 20220231, 12 p. (2023). MSC: 47H10 03C45 39B22 PDFBibTeX XMLCite \textit{A. Turab} et al., Demonstr. Math. 56, Article ID 20220231, 12 p. (2023; Zbl 07720272) Full Text: DOI
Lü, Feng; Jiang, Shuxin On the algebraic differential independence of \(\Gamma\) and \(\zeta\). (English) Zbl 07720081 Monatsh. Math. 202, No. 1, 141-159 (2023). MSC: 33B15 34M05 11M06 30D30 39B22 PDFBibTeX XMLCite \textit{F. Lü} and \textit{S. Jiang}, Monatsh. Math. 202, No. 1, 141--159 (2023; Zbl 07720081) Full Text: DOI
Jarczyk, Witold; Járai, Antal; Matkowski, Janusz; Misiewicz, Jolanta On weak generalized stability of random variables via functional equations. (English) Zbl 1515.60062 Result. Math. 78, No. 5, Paper No. 175, 35 p. (2023). MSC: 60E07 60E05 39B22 39B99 PDFBibTeX XMLCite \textit{W. Jarczyk} et al., Result. Math. 78, No. 5, Paper No. 175, 35 p. (2023; Zbl 1515.60062) Full Text: DOI
Morawiec, Janusz; Szarek, Tomasz Invariant measures for uncountable random interval homeomorphisms. (English) Zbl 1521.37052 Qual. Theory Dyn. Syst. 22, No. 4, Paper No. 124, 16 p. (2023). MSC: 37H12 39B12 47B80 39B22 PDFBibTeX XMLCite \textit{J. Morawiec} and \textit{T. Szarek}, Qual. Theory Dyn. Syst. 22, No. 4, Paper No. 124, 16 p. (2023; Zbl 1521.37052) Full Text: DOI
Boros, Zoltán; Lovas, Rezső L.; Pasteczka, Paweł Correction to: “There is at most one continuous invariant mean”. (English) Zbl 07697395 Aequationes Math. 97, No. 4, 883-885 (2023). MSC: 26E60 39B12 39B22 PDFBibTeX XMLCite \textit{Z. Boros} et al., Aequationes Math. 97, No. 4, 883--885 (2023; Zbl 07697395) Full Text: DOI
Andrews, George E.; Dragović, Vladimir; Radnović, Milena Combinatorics of periodic ellipsoidal billiards. (English) Zbl 1522.37040 Ramanujan J. 61, No. 1, 135-147 (2023). Reviewer: Daniel Jaud (München) MSC: 37C83 37E15 37C27 37C55 05A15 05A17 14H70 37J35 26C05 39B22 PDFBibTeX XMLCite \textit{G. E. Andrews} et al., Ramanujan J. 61, No. 1, 135--147 (2023; Zbl 1522.37040) Full Text: DOI arXiv
Denysenko, N. L.; Yeromina, T. O.; Povarova, O. A. Continuous solutions of difference-functional equations with multiple deviations of the argument. (English. Ukrainian original) Zbl 1515.39011 J. Math. Sci., New York 272, No. 2, 215-227 (2023); translation from Neliniĭni Kolyvannya 24, No. 3, 318-328 (2021). MSC: 39B22 PDFBibTeX XMLCite \textit{N. L. Denysenko} et al., J. Math. Sci., New York 272, No. 2, 215--227 (2023; Zbl 1515.39011); translation from Neliniĭni Kolyvannya 24, No. 3, 318--328 (2021) Full Text: DOI
Kiss, Gergely; Schwaiger, Jens Sincov’s and other functional equations and negative interest rates. (English) Zbl 1522.39017 Aequationes Math. 97, No. 3, 629-637 (2023). Reviewer: José María Almira (Murcia) MSC: 39B22 91B74 91G30 PDFBibTeX XMLCite \textit{G. Kiss} and \textit{J. Schwaiger}, Aequationes Math. 97, No. 3, 629--637 (2023; Zbl 1522.39017) Full Text: DOI arXiv
Burdzy, Krzysztof; Ostaszewski, Adam J. Freezing in space-time: a functional equation linked with a PDE system. (English) Zbl 1515.39010 J. Math. Anal. Appl. 524, No. 2, Article ID 127018, 11 p. (2023). Reviewer: James Adedayo Oguntuase (Abeokuta) MSC: 39B22 PDFBibTeX XMLCite \textit{K. Burdzy} and \textit{A. J. Ostaszewski}, J. Math. Anal. Appl. 524, No. 2, Article ID 127018, 11 p. (2023; Zbl 1515.39010) Full Text: DOI arXiv
Małolepszy, Tomasz; Matkowski, Janusz Translativity of beta-type functions. (English) Zbl 1512.39021 Aequationes Math. 97, No. 1, 121-132 (2023). Reviewer: Eszter Gselmann (Debrecen) MSC: 39B22 PDFBibTeX XMLCite \textit{T. Małolepszy} and \textit{J. Matkowski}, Aequationes Math. 97, No. 1, 121--132 (2023; Zbl 1512.39021) Full Text: DOI
Boros, Zoltán; Menzer, Rayene An alternative equation for generalized monomials. (English) Zbl 1512.39020 Aequationes Math. 97, No. 1, 113-120 (2023). Reviewer: László Losonczi (Debrecen) MSC: 39B22 PDFBibTeX XMLCite \textit{Z. Boros} and \textit{R. Menzer}, Aequationes Math. 97, No. 1, 113--120 (2023; Zbl 1512.39020) Full Text: DOI
Fujita, Yasuhiro; Siconolfi, Antonio; Yamaguchi, Norikazu Hamilton-Jacobi flows with nowhere differentiable initial data. (English) Zbl 1527.35491 Math. Ann. 385, No. 3-4, 1061-1084 (2023). MSC: 35R30 35F21 35F25 26A27 39B22 PDFBibTeX XMLCite \textit{Y. Fujita} et al., Math. Ann. 385, No. 3--4, 1061--1084 (2023; Zbl 1527.35491) Full Text: DOI
Páles, Zsolt; Zakaria, Amr On the equality problem of two-variable Bajraktarević means under first-order differentiability assumptions. (English) Zbl 1512.39022 Aequationes Math. 97, No. 2, 279-294 (2023). Reviewer: Vitaliy Volchkov (Donetsk) MSC: 39B22 39B52 PDFBibTeX XMLCite \textit{Z. Páles} and \textit{A. Zakaria}, Aequationes Math. 97, No. 2, 279--294 (2023; Zbl 1512.39022) Full Text: DOI arXiv
Vigneaux, Juan Pablo A characterization of generalized multinomial coefficients related to the entropic chain rule. (English) Zbl 1511.94025 Aequationes Math. 97, No. 2, 231-255 (2023). MSC: 94A15 05A10 39B22 18G90 94A17 05A16 PDFBibTeX XMLCite \textit{J. P. Vigneaux}, Aequationes Math. 97, No. 2, 231--255 (2023; Zbl 1511.94025) Full Text: DOI
Okeke, Chisom Prince Further results on a new class of functional equations satisfied by polynomial functions. (English) Zbl 1511.39019 Result. Math. 78, No. 3, Paper No. 96, 34 p. (2023). Reviewer: Eszter Gselmann (Debrecen) MSC: 39B22 PDFBibTeX XMLCite \textit{C. P. Okeke}, Result. Math. 78, No. 3, Paper No. 96, 34 p. (2023; Zbl 1511.39019) Full Text: DOI
Idir, Sadani On the stability of new functional equation involving a recurrence relation. (English) Zbl 1515.39012 J. Anal. 31, No. 1, 21-29 (2023). Reviewer: Jacek Chmieliński (Kraków) MSC: 39B22 39B82 PDFBibTeX XMLCite \textit{S. Idir}, J. Anal. 31, No. 1, 21--29 (2023; Zbl 1515.39012) Full Text: DOI
Miahi, Mina; Mirzaee, Farshid; Khodaei, Hamid Heat kernel method for quintic and sextic equations in distributions and hyperfunctions. (English) Zbl 1517.46029 Qual. Theory Dyn. Syst. 22, No. 2, Paper No. 53, 13 p. (2023). MSC: 46F99 39B22 39B82 46F15 PDFBibTeX XMLCite \textit{M. Miahi} et al., Qual. Theory Dyn. Syst. 22, No. 2, Paper No. 53, 13 p. (2023; Zbl 1517.46029) Full Text: DOI
Cubiotti, Paolo; Yao, Jen-Chih An existence result for functional-integral equations associated with discontinuous functions. (English) Zbl 1507.39016 J. Nonlinear Convex Anal. 24, No. 1, 163-176 (2023). MSC: 39B22 45P05 47G10 PDFBibTeX XMLCite \textit{P. Cubiotti} and \textit{J.-C. Yao}, J. Nonlinear Convex Anal. 24, No. 1, 163--176 (2023; Zbl 1507.39016) Full Text: Link
Domínguez, Óscar; Seeger, Andreas; Street, Brian; Van Schaftingen, Jean; Yung, Po-Lam Spaces of Besov-Sobolev type and a problem on nonlinear approximation. (English) Zbl 1517.46024 J. Funct. Anal. 284, No. 4, Article ID 109775, 50 p. (2023). Reviewer: Hans Triebel (Jena) MSC: 46E35 26A33 26D10 35J05 35K05 39B22 42B35 46B70 46E30 PDFBibTeX XMLCite \textit{Ó. Domínguez} et al., J. Funct. Anal. 284, No. 4, Article ID 109775, 50 p. (2023; Zbl 1517.46024) Full Text: DOI arXiv
Chudziak, Jacek Non-periodic solutions of the Gołąb-Schinzel type functional equation. (English) Zbl 1504.39043 Result. Math. 78, No. 1, Paper No. 28, 15 p. (2023). MSC: 39B22 39B52 PDFBibTeX XMLCite \textit{J. Chudziak}, Result. Math. 78, No. 1, Paper No. 28, 15 p. (2023; Zbl 1504.39043) Full Text: DOI
Jarczyk, Witold; Pasteczka, Paweł Extension theorem for simultaneous q-difference equations and some its consequences. arXiv:2311.09927 Preprint, arXiv:2311.09927 [math.CA] (2023). MSC: 39A13 39B72 39B12 39B22 BibTeX Cite \textit{W. Jarczyk} and \textit{P. Pasteczka}, ``Extension theorem for simultaneous q-difference equations and some its consequences'', Preprint, arXiv:2311.09927 [math.CA] (2023) Full Text: arXiv OA License
Fechner, Włodzimierz; Gselmann, Eszter A characterization of differential operators in the ring of complex polynomials. arXiv:2311.04671 Preprint, arXiv:2311.04671 [math.CA] (2023). MSC: 47B92 13B25 39B22 47J05 47A62 47B38 BibTeX Cite \textit{W. Fechner} and \textit{E. Gselmann}, ``A characterization of differential operators in the ring of complex polynomials'', Preprint, arXiv:2311.04671 [math.CA] (2023) Full Text: arXiv OA License
Fechner, Włodzimierz; Gselmann, Eszter; Świątczak, Aleksandra Operator relations characterizing higher-order differential operators. arXiv:2309.03572 Preprint, arXiv:2309.03572 [math.CA] (2023). MSC: 47B92 47J05 47A62 47B38 39B22 BibTeX Cite \textit{W. Fechner} et al., ``Operator relations characterizing higher-order differential operators'', Preprint, arXiv:2309.03572 [math.CA] (2023) Full Text: arXiv OA License
Fechner, Włodzimierz; Gselmann, Eszter; Świątczak, Aleksandra Characterizations of second-order differential operators. arXiv:2306.02788 Preprint, arXiv:2306.02788 [math.CA] (2023). MSC: 47B38 39B22 47A62 47J05 BibTeX Cite \textit{W. Fechner} et al., ``Characterizations of second-order differential operators'', Preprint, arXiv:2306.02788 [math.CA] (2023) Full Text: arXiv OA License
Bauer, Benedict; Gerhold, Stefan A characterization of real matrix semigroups. arXiv:2305.15522 Preprint, arXiv:2305.15522 [math.RA] (2023). MSC: 47D03 39B22 15A16 BibTeX Cite \textit{B. Bauer} and \textit{S. Gerhold}, ``A characterization of real matrix semigroups'', Preprint, arXiv:2305.15522 [math.RA] (2023) Full Text: arXiv OA License
Farhi, Bakir Characterization of the Bernoulli polynomials via the Raabe functional equation. arXiv:2303.14492 Preprint, arXiv:2303.14492 [math.CA] (2023). MSC: 11B68 39B22 39B32 30D05 BibTeX Cite \textit{B. Farhi}, ``Characterization of the Bernoulli polynomials via the Raabe functional equation'', Preprint, arXiv:2303.14492 [math.CA] (2023) Full Text: arXiv OA License
Mihoković, Lenka Asymptotic expansions of stable, stabilizable and stabilized means with applications. arXiv:2303.05217 Preprint, arXiv:2303.05217 [math.CA] (2023). MSC: 26E60 41A60 39B22 BibTeX Cite \textit{L. Mihoković}, ``Asymptotic expansions of stable, stabilizable and stabilized means with applications'', Preprint, arXiv:2303.05217 [math.CA] (2023) Full Text: arXiv OA License
Cimadevilla Villacorta, Jorge Luis; Chaudhary, M. P. New functional relation for the dilogarithm involving two variables. (English) Zbl 07710126 J. Ramanujan Soc. Math. Math. Sci. 10, No. 1, 87-96 (2022). MSC: 33B30 39B22 PDFBibTeX XMLCite \textit{J. L. Cimadevilla Villacorta} and \textit{M. P. Chaudhary}, J. Ramanujan Soc. Math. Math. Sci. 10, No. 1, 87--96 (2022; Zbl 07710126) Full Text: DOI Link
Suriyacharoen, Wuttichai; Laohakosol, Vichian Functional equations characterizing certain determinants and permanents. (English) Zbl 1517.39013 Appl. Math. E-Notes 22, 561-565 (2022). MSC: 39B22 15A15 PDFBibTeX XMLCite \textit{W. Suriyacharoen} and \textit{V. Laohakosol}, Appl. Math. E-Notes 22, 561--565 (2022; Zbl 1517.39013) Full Text: Link
Sumin, V. I. Volterra functional equations in the theory of optimization of distributed systems. On the problem of singularity of controlled initial-boundary value problems. (English. Russian original) Zbl 1510.39017 Proc. Steklov Inst. Math. 319, Suppl. 1, S257-S270 (2022); translation from Tr. Inst. Mat. Mekh. (Ekaterinburg) 28, No. 3, 188-201 (2022). MSC: 39B22 49J21 93C30 PDFBibTeX XMLCite \textit{V. I. Sumin}, Proc. Steklov Inst. Math. 319, S257--S270 (2022; Zbl 1510.39017); translation from Tr. Inst. Mat. Mekh. (Ekaterinburg) 28, No. 3, 188--201 (2022) Full Text: DOI
Glavosits, Tamás; Házy, Attila; Túri, József Decomposition of functional equations with applications. (English) Zbl 1513.39059 Miskolc Math. Notes 23, No. 2, 691-701 (2022). MSC: 39B22 PDFBibTeX XMLCite \textit{T. Glavosits} et al., Miskolc Math. Notes 23, No. 2, 691--701 (2022; Zbl 1513.39059) Full Text: DOI
Lyalinov, M. A. Eigenoscillations in an angular domain and spectral properties of functional equations. (English) Zbl 1504.35201 Eur. J. Appl. Math. 33, No. 3, 538-559 (2022). MSC: 35P05 35A22 35C15 35J25 39B22 PDFBibTeX XMLCite \textit{M. A. Lyalinov}, Eur. J. Appl. Math. 33, No. 3, 538--559 (2022; Zbl 1504.35201) Full Text: DOI
Akkaoui, Ahmed; El Fatini, Mohamed An integral functional equation on abelian semigroups. (English) Zbl 1513.39057 Publ. Inst. Math., Nouv. Sér. 112(126), 111-121 (2022). MSC: 39B22 39B32 PDFBibTeX XMLCite \textit{A. Akkaoui} and \textit{M. El Fatini}, Publ. Inst. Math., Nouv. Sér. 112(126), 111--121 (2022; Zbl 1513.39057) Full Text: DOI
Polat, Refet On a solution to a nonlocal inverse coefficient problem using feed-forward neural networks. (English) Zbl 1518.35683 Proc. Inst. Math. Mech., Natl. Acad. Sci. Azerb. 48, No. 2, 249-258 (2022). MSC: 35R30 26B40 35K20 39B22 PDFBibTeX XMLCite \textit{R. Polat}, Proc. Inst. Math. Mech., Natl. Acad. Sci. Azerb. 48, No. 2, 249--258 (2022; Zbl 1518.35683) Full Text: DOI
Alsmeyer, Gerold; Mallein, Bastien A simple method to find all solutions to the functional equation of the smoothing transform. (English) Zbl 1502.39012 J. Theor. Probab. 35, No. 4, 2569-2599 (2022). Reviewer: Eszter Gselmann (Debrecen) MSC: 39B22 60E05 60J85 60G42 PDFBibTeX XMLCite \textit{G. Alsmeyer} and \textit{B. Mallein}, J. Theor. Probab. 35, No. 4, 2569--2599 (2022; Zbl 1502.39012) Full Text: DOI arXiv
Turab, Ali On a unique solution and stability analysis of a class of stochastic functional equations arising in learning theory. (English) Zbl 1501.39011 Analysis, München 42, No. 4, 261-269 (2022). MSC: 39B22 39B82 47H10 68T99 PDFBibTeX XMLCite \textit{A. Turab}, Analysis, München 42, No. 4, 261--269 (2022; Zbl 1501.39011) Full Text: DOI
Sumin, Vladimir Iosifovich; Sumin, Mikhail Iosifovich On regularization of the Lagrange principle in the optimization problems for linear distributed Volterra type systems with operator constraints. (Russian. English summary) Zbl 1498.49036 Izv. Inst. Mat. Inform., Udmurt. Gos. Univ. 59, 85-113 (2022). MSC: 49K20 39B22 49N15 47A52 PDFBibTeX XMLCite \textit{V. I. Sumin} and \textit{M. I. Sumin}, Izv. Inst. Mat. Inform., Udmurt. Gos. Univ. 59, 85--113 (2022; Zbl 1498.49036) Full Text: DOI MNR
Aliev, Rashid A.; Asgarova, Aysel A.; Ismailov, Vugar E. The double difference property for the class of locally Hölder continuous functions. (English) Zbl 1508.39014 Mosc. Math. J. 22, No. 3, 393-400 (2022). MSC: 39A70 39B22 26B05 47B39 PDFBibTeX XMLCite \textit{R. A. Aliev} et al., Mosc. Math. J. 22, No. 3, 393--400 (2022; Zbl 1508.39014) Full Text: arXiv Link
Kiss, Tibor Regular solutions of a functional equation derived from the invariance problem of Matkowski means. (English) Zbl 1502.39013 Aequationes Math. 96, No. 5, 1089-1124 (2022). Reviewer: Jacek Chmieliński (Kraków) MSC: 39B22 26E60 39B72 PDFBibTeX XMLCite \textit{T. Kiss}, Aequationes Math. 96, No. 5, 1089--1124 (2022; Zbl 1502.39013) Full Text: DOI arXiv
Kopeček, Oldřich The solvability of \(f(p(x)) = q(f(x))\) for given strictly monotonous continuous real functions \(p\), \(q\). (English) Zbl 1507.26019 Aequationes Math. 96, No. 5, 901-925 (2022). MSC: 26A48 39B22 65Q20 PDFBibTeX XMLCite \textit{O. Kopeček}, Aequationes Math. 96, No. 5, 901--925 (2022; Zbl 1507.26019) Full Text: DOI
Dhiman, Deepak; Mishra, Lakshmi Narayan; Mishra, Vishnu Narayan Solvability of some nonlinear functional integral equations via measure of noncompactness. (English) Zbl 1522.47077 Adv. Stud. Contemp. Math., Kyungshang 32, No. 2, 157-171 (2022). Reviewer: Jürgen Appell (Würzburg) MSC: 47H10 47H08 39B22 47N20 PDFBibTeX XMLCite \textit{D. Dhiman} et al., Adv. Stud. Contemp. Math., Kyungshang 32, No. 2, 157--171 (2022; Zbl 1522.47077)
Dăianu, Dan M. Sections in functional equations: stability and hyperstability. (English) Zbl 1514.39017 Aequationes Math. 96, No. 4, 867-883 (2022). Reviewer: Nasrin Eghbali (Ardabil) MSC: 39B82 39B52 39B22 PDFBibTeX XMLCite \textit{D. M. Dăianu}, Aequationes Math. 96, No. 4, 867--883 (2022; Zbl 1514.39017) Full Text: DOI
Pasteczka, Paweł There is at most one continuous invariant mean. (English) Zbl 1503.26092 Aequationes Math. 96, No. 4, 833-841 (2022); correction ibid. 97, No. 4, 883-885 (2023). MSC: 26E60 39B12 39B22 PDFBibTeX XMLCite \textit{P. Pasteczka}, Aequationes Math. 96, No. 4, 833--841 (2022; Zbl 1503.26092) Full Text: DOI arXiv
Moszner, Zenon On the differentiability of the solutions of translation equation. (English) Zbl 1494.39022 Aequationes Math. 96, No. 4, 723-739 (2022). Reviewer: Eszter Gselmann (Debrecen) MSC: 39B22 26A24 39B82 PDFBibTeX XMLCite \textit{Z. Moszner}, Aequationes Math. 96, No. 4, 723--739 (2022; Zbl 1494.39022) Full Text: DOI
Grünwald, R.; Páles, Zs. On the invariance of the arithmetic mean with respect to generalized Bajraktarević means. (English) Zbl 1513.39060 Acta Math. Hung. 166, No. 2, 594-613 (2022). Reviewer: Eszter Gselmann (Debrecen) MSC: 39B22 26E60 PDFBibTeX XMLCite \textit{R. Grünwald} and \textit{Zs. Páles}, Acta Math. Hung. 166, No. 2, 594--613 (2022; Zbl 1513.39060) Full Text: DOI arXiv
Acu, Ana-Maria; Rasa, Ioan Functional equations related to Appell polynomials and Heun functions. (English) Zbl 1511.39018 Anal. Math. Phys. 12, No. 3, Paper No. 77, 18 p. (2022). Reviewer: Roberto S. Costas-Santos (Sevilla) MSC: 39B22 33E30 33C45 33C65 33C47 PDFBibTeX XMLCite \textit{A.-M. Acu} and \textit{I. Rasa}, Anal. Math. Phys. 12, No. 3, Paper No. 77, 18 p. (2022; Zbl 1511.39018) Full Text: DOI
Boros, Zoltán; Garda-Mátyás, Edit Conditional equations for monomial functions. (English) Zbl 1499.39092 Publ. Math. Debr. 100, No. 3-4, 263-276 (2022). Reviewer: László Losonczi (Debrecen) MSC: 39B22 PDFBibTeX XMLCite \textit{Z. Boros} and \textit{E. Garda-Mátyás}, Publ. Math. Debr. 100, No. 3--4, 263--276 (2022; Zbl 1499.39092) Full Text: DOI
Okeke, Chisom Prince; Sablik, Maciej Functional equation characterizing polynomial functions and an algorithm. (English) Zbl 1489.39030 Result. Math. 77, No. 3, Paper No. 125, 17 p. (2022). Reviewer: Eszter Gselmann (Debrecen) MSC: 39B22 39-04 PDFBibTeX XMLCite \textit{C. P. Okeke} and \textit{M. Sablik}, Result. Math. 77, No. 3, Paper No. 125, 17 p. (2022; Zbl 1489.39030) Full Text: DOI
Crespo, Francisco; Rebollo-Perdomo, Salomón; Zapata, Jorge L. Addition theorems for \(\mathcal{C}^k\) real functions and applications in ordinary differential equations. (English) Zbl 1493.39026 Aequationes Math. 96, No. 2, 431-452 (2022). Reviewer: Jacek Chmieliński (Kraków) MSC: 39B22 26A30 41A10 65L05 PDFBibTeX XMLCite \textit{F. Crespo} et al., Aequationes Math. 96, No. 2, 431--452 (2022; Zbl 1493.39026) Full Text: DOI arXiv
Bekker, Boris; Podkopaev, Oleg On the functional equation \(f(\alpha x+\beta )=f(x)\). (English) Zbl 1489.39029 Aequationes Math. 96, No. 2, 349-360 (2022). Reviewer: James Adedayo Oguntuase (Abeokuta) MSC: 39B22 12E05 11R27 PDFBibTeX XMLCite \textit{B. Bekker} and \textit{O. Podkopaev}, Aequationes Math. 96, No. 2, 349--360 (2022; Zbl 1489.39029) Full Text: DOI
Nath, Prem; Singh, Dhiraj Kumar On the general solutions of three functional equations. (English) Zbl 1487.39030 Aequationes Math. 96, No. 2, 325-338 (2022). MSC: 39B22 39B52 PDFBibTeX XMLCite \textit{P. Nath} and \textit{D. K. Singh}, Aequationes Math. 96, No. 2, 325--338 (2022; Zbl 1487.39030) Full Text: DOI
Bouyssou, Denis; Marchant, Thierry; Pirlot, Marc Axiomatic characterization of the \(\chi^2\) dissimilarity measure. (English) Zbl 1487.39029 Aequationes Math. 96, No. 2, 307-323 (2022). MSC: 39B22 62G10 PDFBibTeX XMLCite \textit{D. Bouyssou} et al., Aequationes Math. 96, No. 2, 307--323 (2022; Zbl 1487.39029) Full Text: DOI arXiv
Morawiec, Janusz; Zürcher, Thomas A new take on random interval homeomorphisms. (English) Zbl 1501.37054 Fundam. Math. 257, No. 1, 1-17 (2022). MSC: 37H12 37E05 37C40 39B12 47B80 39B22 PDFBibTeX XMLCite \textit{J. Morawiec} and \textit{T. Zürcher}, Fundam. Math. 257, No. 1, 1--17 (2022; Zbl 1501.37054) Full Text: DOI
Matkowski, Janusz Complementary means with respect to a nonsymmetric invariant mean. (English) Zbl 1500.26019 Aequationes Math. 96, No. 1, 43-51 (2022). Reviewer: Jacek Chmieliński (Kraków) MSC: 26E60 39B12 39B22 PDFBibTeX XMLCite \textit{J. Matkowski}, Aequationes Math. 96, No. 1, 43--51 (2022; Zbl 1500.26019) Full Text: DOI
Głazowska, Dorota; Matkowski, Janusz Generalized classical weighted means, the invariance, complementarity and convergence of iterates of the mean-type mappings. (English) Zbl 1494.26065 Result. Math. 77, No. 2, Paper No. 72, 17 p. (2022). MSC: 26E60 39B12 39B22 PDFBibTeX XMLCite \textit{D. Głazowska} and \textit{J. Matkowski}, Result. Math. 77, No. 2, Paper No. 72, 17 p. (2022; Zbl 1494.26065) Full Text: DOI
Nguyen Van Minh; Matsunaga, Hideaki; Nguyen Duc Huy; Vu Trong Luong A Katznelson-Tzafriri type theorem for difference equations and applications. (English) Zbl 1480.39002 Proc. Am. Math. Soc. 150, No. 3, 1105-1114 (2022). MSC: 39A06 39A30 39B22 47B39 47B48 PDFBibTeX XMLCite \textit{Nguyen Van Minh} et al., Proc. Am. Math. Soc. 150, No. 3, 1105--1114 (2022; Zbl 1480.39002) Full Text: DOI
Turab, Ali; Bakery, Awad A.; Mohamed, O. M. Kalthum S. K.; Ali, Wajahat On a unique solution of the stochastic functional equation arising in gambling theory and human learning process. (English) Zbl 1482.39033 J. Funct. Spaces 2022, Article ID 1064803, 8 p. (2022). MSC: 39B22 91A26 91D15 93E35 PDFBibTeX XMLCite \textit{A. Turab} et al., J. Funct. Spaces 2022, Article ID 1064803, 8 p. (2022; Zbl 1482.39033) Full Text: DOI
Farzadfard, Hojjat Periodic solutions of the Poincaré functional equation: uniqueness. (English) Zbl 1479.39028 Proc. Am. Math. Soc. 150, No. 1, 279-288 (2022). Reviewer: Jacek Chmieliński (Kraków) MSC: 39B22 26A18 39B12 PDFBibTeX XMLCite \textit{H. Farzadfard}, Proc. Am. Math. Soc. 150, No. 1, 279--288 (2022; Zbl 1479.39028) Full Text: DOI
López, Ronald Orozco Existence of Solutions of Functional-Difference Equations with Proportional Delay on Deformed Generalized Fibonacci Polynomials via Successive Approximation and Bell Polynomials. arXiv:2211.04450 Preprint, arXiv:2211.04450 [math.CO] (2022). MSC: 39B22 11B39 11B65 30B10 34K06 BibTeX Cite \textit{R. O. López}, ``Existence of Solutions of Functional-Difference Equations with Proportional Delay on Deformed Generalized Fibonacci Polynomials via Successive Approximation and Bell Polynomials'', Preprint, arXiv:2211.04450 [math.CO] (2022) Full Text: arXiv OA License
Bikila, Yadeta Hailu Closed-form formula for some recursively-defined integro-difference sequence of functions. arXiv:2211.03239 Preprint, arXiv:2211.03239 [math.CA] (2022). MSC: 45E10 39B12 39B22 BibTeX Cite \textit{Y. H. Bikila}, ``Closed-form formula for some recursively-defined integro-difference sequence of functions'', Preprint, arXiv:2211.03239 [math.CA] (2022) Full Text: arXiv OA License
Marichal, Jean-Luc; Zenaïdi, Naïm A generalization of Bohr-Mollerup’s theorem for higher order convex functions: a tutorial. arXiv:2207.12694 Preprint, arXiv:2207.12694 [math.CA] (2022). MSC: 26A51 33B15 33B20 39A06 39B22 BibTeX Cite \textit{J.-L. Marichal} and \textit{N. Zenaïdi}, ``A generalization of Bohr-Mollerup's theorem for higher order convex functions: a tutorial'', Preprint, arXiv:2207.12694 [math.CA] (2022) Full Text: DOI arXiv OA License
Glavosits, T.; Karácsony, Zs. Sums and products of intervals in ordered semigroups. (English) Zbl 07660050 An. Științ. Univ. “Ovidius” Constanța, Ser. Mat. 29, No. 2, 187-198 (2021). MSC: 06F05 39B22 03E04 06F15 12J15 PDFBibTeX XMLCite \textit{T. Glavosits} and \textit{Zs. Karácsony}, An. Științ. Univ. ``Ovidius'' Constanța, Ser. Mat. 29, No. 2, 187--198 (2021; Zbl 07660050) Full Text: DOI
Bodaghi, Abasalt; Moshtagh, Hossein; Dutta, Hemen Characterization and stability analysis of advanced multi-quadratic functional equations. (English) Zbl 1494.39026 Adv. Difference Equ. 2021, Paper No. 380, 15 p. (2021). MSC: 39B82 39B22 PDFBibTeX XMLCite \textit{A. Bodaghi} et al., Adv. Difference Equ. 2021, Paper No. 380, 15 p. (2021; Zbl 1494.39026) Full Text: DOI
Sarfraz, Muhammad; Li, Yongjin Minimum functional equation and some Pexider-type functional equation on any group. (English) Zbl 1525.39021 AIMS Math. 6, No. 10, 11305-11317 (2021). MSC: 39B52 39B22 39B82 PDFBibTeX XMLCite \textit{M. Sarfraz} and \textit{Y. Li}, AIMS Math. 6, No. 10, 11305--11317 (2021; Zbl 1525.39021) Full Text: DOI
Dil’man, Valeriĭ Leĭzerovich; Komissarova, Dar’ya Amirovna Existence and uniqueness conditions for solutions of linear functional equations in the classes of Lebesgue functions antiderivatives on a simple smooth curve. (Russian. English summary) Zbl 1490.39030 Vestn. Yuzhno-Ural. Gos. Univ., Ser. Mat., Mekh., Fiz. 13, No. 4, 13-23 (2021). MSC: 39B22 45E99 26A42 PDFBibTeX XMLCite \textit{V. L. Dil'man} and \textit{D. A. Komissarova}, Vestn. Yuzhno-Ural. Gos. Univ., Ser. Mat., Mekh., Fiz. 13, No. 4, 13--23 (2021; Zbl 1490.39030) Full Text: DOI MNR
Ismailov, Vugar E. Ridge functions and applications in neural networks. (English) Zbl 1489.26001 Mathematical Surveys and Monographs 263. Providence, RI: American Mathematical Society (AMS) (ISBN 978-1-4704-6765-4/pbk; 978-1-4704-6800-2/ebook). ix, 186 p. (2021). Reviewer: Bilal Bilalov (Baku) MSC: 26-02 26B40 39B22 41A30 41A50 41A63 92-01 92B20 PDFBibTeX XMLCite \textit{V. E. Ismailov}, Ridge functions and applications in neural networks. Providence, RI: American Mathematical Society (AMS) (2021; Zbl 1489.26001) Full Text: DOI
Sumin, Vladimir Iosifovich; Sumin, Mikhail Iosifovich Regularized classical optimality conditions in iterative form for convex optimization problems for distributed Volterra-type systems. (Russian. English summary) Zbl 1483.49029 Vestn. Udmurt. Univ., Mat. Mekh. Komp’yut. Nauki 31, No. 2, 265-284 (2021). MSC: 49K20 39B22 49N15 47A52 PDFBibTeX XMLCite \textit{V. I. Sumin} and \textit{M. I. Sumin}, Vestn. Udmurt. Univ., Mat. Mekh. Komp'yut. Nauki 31, No. 2, 265--284 (2021; Zbl 1483.49029) Full Text: DOI MNR
Li, Dongchang; La Torre, Davide; Vrscay, Edward R. The intensity-based measure approach to “Weberize” \(L^2\)-based methods of signal and image approximation. (English) Zbl 1481.94021 Optim. Eng. 22, No. 4, 2321-2347 (2021). MSC: 94A08 94A12 39B12 39B22 PDFBibTeX XMLCite \textit{D. Li} et al., Optim. Eng. 22, No. 4, 2321--2347 (2021; Zbl 1481.94021) Full Text: DOI
Glavosits, Tamás; Karácsony, Zsolt Sums and products of intervals in ordered groups and fields. (English) Zbl 07451012 Acta Univ. Sapientiae, Math. 13, No. 1, 182-191 (2021). MSC: 06Fxx 39B22 20F60 PDFBibTeX XMLCite \textit{T. Glavosits} and \textit{Z. Karácsony}, Acta Univ. Sapientiae, Math. 13, No. 1, 182--191 (2021; Zbl 07451012) Full Text: DOI
Kühn, F.; Schilling, R. L. For which functions are \(f(X_t)-\mathbb{E} f(X_t)\) and \(g(X_t)/\mathbb{E} g(X_t)\) martingales? (English) Zbl 1490.60100 Theory Probab. Math. Stat. 105, 79-91 (2021). Reviewer: Pavel Gapeev (London) MSC: 60G44 60G51 60J65 39B22 45E10 PDFBibTeX XMLCite \textit{F. Kühn} and \textit{R. L. Schilling}, Theory Probab. Math. Stat. 105, 79--91 (2021; Zbl 1490.60100) Full Text: DOI arXiv
Gilányi, Attila; Lewicka, Agata On linear functional equations modulo \({\mathbb{Z}} \). (English) Zbl 1481.39022 Aequationes Math. 95, No. 6, 1301-1311 (2021). Reviewer: Jacek Chmieliński (Kraków) MSC: 39B52 39B22 PDFBibTeX XMLCite \textit{A. Gilányi} and \textit{A. Lewicka}, Aequationes Math. 95, No. 6, 1301--1311 (2021; Zbl 1481.39022) Full Text: DOI
Forti, Gian Luigi Alternative Cauchy equation in three unknown functions. (English) Zbl 1480.39019 Aequationes Math. 95, No. 6, 1233-1242 (2021). Reviewer: Xueyan Liu (New Orleans) MSC: 39B22 PDFBibTeX XMLCite \textit{G. L. Forti}, Aequationes Math. 95, No. 6, 1233--1242 (2021; Zbl 1480.39019) Full Text: DOI
Ger, Roman On alienation of two functional equations of quadratic type. (English) Zbl 1482.39030 Aequationes Math. 95, No. 6, 1169-1180 (2021). Reviewer: Gian Luigi Forti (Milano) MSC: 39B22 PDFBibTeX XMLCite \textit{R. Ger}, Aequationes Math. 95, No. 6, 1169--1180 (2021; Zbl 1482.39030) Full Text: DOI
Nadhomi, Timothy; Okeke, Chisom Prince; Sablik, Maciej; Szostok, Tomasz On a new class of functional equations satisfied by polynomial functions. (English) Zbl 1482.39032 Aequationes Math. 95, No. 6, 1095-1117 (2021). Reviewer: Gian Luigi Forti (Milano) MSC: 39B22 PDFBibTeX XMLCite \textit{T. Nadhomi} et al., Aequationes Math. 95, No. 6, 1095--1117 (2021; Zbl 1482.39032) Full Text: DOI
Matkowski, Janusz Quasi-Cauchy quotients and means. (English) Zbl 1491.26028 Aequationes Math. 95, No. 6, 1067-1094 (2021). Reviewer: Thomas Riedel (Louisville) MSC: 26E60 39B12 39B22 PDFBibTeX XMLCite \textit{J. Matkowski}, Aequationes Math. 95, No. 6, 1067--1094 (2021; Zbl 1491.26028) Full Text: DOI
Losonczi, László; Páles, Zsolt; Zakaria, Amr On the equality of two-variable general functional means. (English) Zbl 1482.39031 Aequationes Math. 95, No. 6, 1011-1036 (2021). Reviewer: James Adedayo Oguntuase (Abeokuta) MSC: 39B22 26E60 PDFBibTeX XMLCite \textit{L. Losonczi} et al., Aequationes Math. 95, No. 6, 1011--1036 (2021; Zbl 1482.39031) Full Text: DOI arXiv
Kalachev, G. V.; Sadov, S. Yu. An existence criterion for maximizers of convolution operators in \(L_1(\mathbb{R}^n)\). (English. Russian original) Zbl 1478.39024 Mosc. Univ. Math. Bull. 76, No. 4, 161-167 (2021); translation from Vestn. Mosk. Univ., Ser. I 76, No. 4, 17-22 (2021). MSC: 39B32 39B22 PDFBibTeX XMLCite \textit{G. V. Kalachev} and \textit{S. Yu. Sadov}, Mosc. Univ. Math. Bull. 76, No. 4, 161--167 (2021; Zbl 1478.39024); translation from Vestn. Mosk. Univ., Ser. I 76, No. 4, 17--22 (2021) Full Text: DOI