Ciepliński, Krzysztof Set-valued solutions of a functional equation. (English) Zbl 07510861 Bol. Soc. Mat. Mex., III. Ser. 28, No. 2, Paper No. 35, 7 p. (2022). MSC: 47H04 39B52 54C60 26E25 PDFBibTeX XMLCite \textit{K. Ciepliński}, Bol. Soc. Mat. Mex., III. Ser. 28, No. 2, Paper No. 35, 7 p. (2022; Zbl 07510861) Full Text: DOI
Jin, Zhenyu; Wu, Jianrong Ulam stability of two fuzzy number-valued functional equations. (English) Zbl 1484.39033 AIMS Math. 5, No. 5, 5055-5062 (2020). MSC: 39B82 39B72 39B52 03E72 26E50 PDFBibTeX XMLCite \textit{Z. Jin} and \textit{J. Wu}, AIMS Math. 5, No. 5, 5055--5062 (2020; Zbl 1484.39033) Full Text: DOI
Adamek, Mirosław Characterization of inner product spaces and quadratic functions by some classes of functions. (English) Zbl 1451.46024 Math. Inequal. Appl. 23, No. 2, 439-445 (2020). Reviewer: V. Lokesha (Bangalore) MSC: 46C15 26B25 39B62 PDFBibTeX XMLCite \textit{M. Adamek}, Math. Inequal. Appl. 23, No. 2, 439--445 (2020; Zbl 1451.46024) Full Text: DOI
Sikorska, Justyna On a class of abstract convex cone valued functional equations. (English) Zbl 1440.39014 Aequationes Math. 94, No. 3, 535-545 (2020). MSC: 39B52 39B82 54C60 26E25 PDFBibTeX XMLCite \textit{J. Sikorska}, Aequationes Math. 94, No. 3, 535--545 (2020; Zbl 1440.39014) Full Text: DOI
Adamek, Mirosław Characterization of inner product spaces by strongly Schur-convex functions. (English) Zbl 1444.46022 Result. Math. 75, No. 2, Paper No. 72, 8 p. (2020). Reviewer: Mohammad Sal Moslehian (Mashhad) MSC: 46C15 26B25 39B62 PDFBibTeX XMLCite \textit{M. Adamek}, Result. Math. 75, No. 2, Paper No. 72, 8 p. (2020; Zbl 1444.46022) Full Text: DOI
Rooin, J.; Rajabi, S.; Moslehian, M. S. Extension of Dunkl-Williams inequality and characterizations of inner product spaces. (English) Zbl 1443.46014 Rocky Mt. J. Math. 49, No. 8, 2755-2777 (2019). MSC: 46C15 47A30 26D15 PDFBibTeX XMLCite \textit{J. Rooin} et al., Rocky Mt. J. Math. 49, No. 8, 2755--2777 (2019; Zbl 1443.46014) Full Text: DOI Euclid
Laczkovich, Miklós Continuous solutions of the equation \(x+g(y+f(x))=y+g(x+f(y))\). (English) Zbl 1429.39014 Aequationes Math. 93, No. 6, 1139-1157 (2019). Reviewer: James Adedayo Oguntuase (Abeokuta) MSC: 39B22 26E60 PDFBibTeX XMLCite \textit{M. Laczkovich}, Aequationes Math. 93, No. 6, 1139--1157 (2019; Zbl 1429.39014) Full Text: DOI
Lee, Jung Rye; Najati, Abbas; Park, Choonkil; Rassias, Themistocles M. On the stability of a Cauchy type functional equation. (English) Zbl 1404.39032 Demonstr. Math. 51, 323-331 (2018). MSC: 39B82 34K20 26D10 PDFBibTeX XMLCite \textit{J. R. Lee} et al., Demonstr. Math. 51, 323--331 (2018; Zbl 1404.39032) Full Text: DOI
Stefan, Marinescu Dan; Mihai, Monea; Cristinel, Mortici Some characterizations of inner product spaces via some geometrical inequalities. (English) Zbl 1499.46053 Appl. Anal. Discrete Math. 11, No. 2, 424-433 (2017). MSC: 46C15 26D10 PDFBibTeX XMLCite \textit{M. D. Stefan} et al., Appl. Anal. Discrete Math. 11, No. 2, 424--433 (2017; Zbl 1499.46053) Full Text: DOI
Fechner, Włodzimierz Hlawka’s functional inequality on topological groups. (English) Zbl 1352.39016 Banach J. Math. Anal. 11, No. 1, 130-142 (2017). MSC: 39B62 26A15 42A16 41A25 41A27 PDFBibTeX XMLCite \textit{W. Fechner}, Banach J. Math. Anal. 11, No. 1, 130--142 (2017; Zbl 1352.39016) Full Text: DOI Euclid
Sikorska, Justyna A singular behaviour of a set-valued approximate orthogonal additivity. (English) Zbl 1347.41045 Result. Math. 70, No. 1-2, 163-172 (2016). MSC: 41A65 54C60 26E25 39B82 PDFBibTeX XMLCite \textit{J. Sikorska}, Result. Math. 70, No. 1--2, 163--172 (2016; Zbl 1347.41045) Full Text: DOI
Alzer, Horst A Kuczma-type functional inequality for error and complementary error functions. (English) Zbl 1321.26035 Aequationes Math. 89, No. 3, 927-935 (2015). Reviewer: József Sándor (Cluj-Napoca) MSC: 26D07 33B20 39B62 PDFBibTeX XMLCite \textit{H. Alzer}, Aequationes Math. 89, No. 3, 927--935 (2015; Zbl 1321.26035) Full Text: DOI
Nikodem, Kazimierz On strongly convex functions and related classes of functions. (English) Zbl 1316.26014 Rassias, Themistocles M. (ed.), Handbook of functional equations. Functional inequalities. New York, NY: Springer (ISBN 978-1-4939-1245-2/hbk; 978-1-4939-1246-9/ebook). Springer Optimization and Its Applications 95, 365-405 (2014). MSC: 26B25 26A51 46C15 PDFBibTeX XMLCite \textit{K. Nikodem}, Springer Optim. Appl. 95, 365--405 (2014; Zbl 1316.26014) Full Text: DOI
Domański, Paweł; Wnuk, Witold On the work of Lech Drewnowski. (English) Zbl 1296.26008 Funct. Approximatio, Comment. Math. 50, No. 1, 7-53 (2014). MSC: 26-03 01A70 PDFBibTeX XMLCite \textit{P. Domański} and \textit{W. Wnuk}, Funct. Approximatio, Comment. Math. 50, No. 1, 7--53 (2014; Zbl 1296.26008) Full Text: DOI Euclid
Lee, Jung Rye; Lee, Sung Jin; Park, Choonkil Orthogonally additive and orthogonally quadratic functional equation. (English) Zbl 1524.39043 Korean J. Math. 21, No. 1, 1-21 (2013). MSC: 39B72 39B52 54E40 47H10 46S10 47S10 26E30 PDFBibTeX XMLCite \textit{J. R. Lee} et al., Korean J. Math. 21, No. 1, 1--21 (2013; Zbl 1524.39043) Full Text: DOI
Kenary, Hassan Azadi; Park, Choonkil; Rezaei, Hamid; Jang, Sun Young Stability of a generalized quadratic functional equation in various spaces: a fixed point alternative approach. (English) Zbl 1273.39020 Adv. Difference Equ. 2011, Paper No. 62, 17 p. (2011). MSC: 39B52 46S40 34K36 47S40 26E50 47H10 39B82 PDFBibTeX XMLCite \textit{H. A. Kenary} et al., Adv. Difference Equ. 2011, Paper No. 62, 17 p. (2011; Zbl 1273.39020) Full Text: DOI