1. Interview with Ludwig Reich

   • Arnold R. Kräuter

   OriginalPaper Open access 09 November 2021 Pages: 1001 - 1010

   

2. On the equality of two-variable general functional means

   • László Losonczi
   • Zsolt Páles
   • Amr Zakaria

   OriginalPaper Open access 30 September 2020 Pages: 1011 - 1036

3. Stability results and separations theorems

   • Roman Badora

   OriginalPaper Open access 24 April 2021 Pages: 1037 - 1051

4. Reduction formulas for higher order derivations and a hypergeometric identity

   • Bruce Ebanks
   • André E. Kézdy

   OriginalPaper 01 July 2021 Pages: 1053 - 1065

5. Quasi-Cauchy quotients and means

   • Janusz Matkowski

   OriginalPaper Open access 13 November 2021 Pages: 1067 - 1094

6. On a new class of functional equations satisfied by polynomial functions

   • Timothy Nadhomi
   • Chisom Prince Okeke
   • Tomasz Szostok

   OriginalPaper Open access 12 February 2021 Pages: 1095 - 1117

7. Commutants of the multidimensional Jennings group

   • S. A. Bogatyy

   OriginalPaper 07 March 2021 Pages: 1119 - 1130

8. k-Valued Wilson functions

   • Henrik Stetkær

   OriginalPaper 12 February 2021 Pages: 1131 - 1147

9. Eri Jabotinsky, mathematician and politician: a short biography

   • Detlef Gronau

   OriginalPaper Open access 13 February 2021 Pages: 1149 - 1155

   

10. Continuous solutions to two iterative functional equations

    • Karol Baron

    OriginalPaper Open access 23 March 2021 Pages: 1157 - 1168

11. On alienation of two functional equations of quadratic type

    • Roman Ger

    OriginalPaper Open access 03 July 2021 Pages: 1169 - 1180

    

12. Linear functional equations and their solutions in generalized Orlicz spaces

    • Janusz Morawiec
    • Thomas Zürcher

    OriginalPaper Open access 01 November 2021 Pages: 1181 - 1193

13. The solvability cardinal of the class of polynomials

    • Miklós Laczkovich

    OriginalPaper Open access 09 June 2021 Pages: 1195 - 1219

14. K-subadditive and K-superadditive set-valued functions bounded on “large” sets

    • Eliza Jabłońska
    • Kazimierz Nikodem

    OriginalPaper Open access 07 October 2021 Pages: 1221 - 1231

15. Alternative Cauchy equation in three unknown functions

    • Gian Luigi Forti

    OriginalPaper Open access 15 March 2021 Pages: 1233 - 1242

16. Some remarks on the stability of the Cauchy equation and completeness

    • Harald Fripertinger
    • Jens Schwaiger

    OriginalPaper Open access 19 May 2021 Pages: 1243 - 1255

17. On a general bilinear functional equation

    • Anna Bahyrycz
    • Justyna Sikorska

    OriginalPaper Open access 24 June 2021 Pages: 1257 - 1279

    

18. Moment functions and exponential monomials on commutative hypergroups

    • Żywilla Fechner
    • Eszter Gselmann
    • László Székelyhidi

    OriginalPaper Open access 28 June 2021 Pages: 1281 - 1290

19. Note on generalized Archimedes–Borchardt algorithm

    • Justyna Jarczyk
    • Witold Jarczyk

    OriginalPaper Open access 04 June 2021 Pages: 1291 - 1300

20. On linear functional equations modulo \({\mathbb {Z}}\)

    • Attila Gilányi
    • Agata Lewicka

    OriginalPaper Open access 09 November 2021 Pages: 1301 - 1311