1. Roman Ger, 70 years of a mathematician’s adventurous life

   • Maciej Sablik

   OriginalPaper Open access 15 February 2016 Pages: 1 - 5

2. Remark on the graph of additive functions

   • László Székelyhidi

   OriginalPaper 06 August 2015 Pages: 7 - 9

3. Orthogonality equation with two unknown functions

   • Jacek Chmieliński

   OriginalPaper Open access 21 June 2015 Pages: 11 - 23

4. Van Vleck’s functional equation for the sine

   • Henrik Stetkær

   OriginalPaper 07 April 2015 Pages: 25 - 34

5. Generalized Pexider difference equations

   • Bruce Ebanks

   OriginalPaper 14 January 2016 Pages: 35 - 45

6. Strong convexity and separation theorems

   • Nelson Merentes
   • Kazimierz Nikodem

   OriginalPaper Open access 26 June 2015 Pages: 47 - 55

7. On the alienation of the exponential Cauchy equation and the Hosszú equation

   • Gyula Maksa
   • Maciej Sablik

   OriginalPaper 19 June 2015 Pages: 57 - 66

8. Stability of a functional equation for generalized polynomials

   • Wolfgang Prager
   • Jens Schwaiger

   OriginalPaper 26 September 2015 Pages: 67 - 75

9. On Lipschitzian solutions to an inhomogeneous linear iterative equation

   • Karol Baron
   • Rafał Kapica
   • Janusz Morawiec

   OriginalPaper Open access 06 November 2015 Pages: 77 - 85

10. On a functional equation on groups with an involution related to quadratic polynomials in two variables

    • Heather B. Hunt
    • Thomas Riedel
    • Prasanna K. Sahoo

    OriginalPaper 06 August 2015 Pages: 87 - 96

11. Erratum to: On a functional equation on groups with an involution related to quadratic polynomials in two variables

    • Heather B. Hunt
    • Thomas Riedel
    • Prasanna K. Sahoo

    Erratum 27 October 2015 Pages: 97 - 98

12. Convergence in measure and in category, similarities and differences

    • Władysław Wilczyński

    OriginalPaper Open access 03 February 2016 Pages: 99 - 105

13. Alienation of the logarithmic and exponential functional equations

    • Zygfryd Kominek
    • Justyna Sikorska

    OriginalPaper Open access 11 July 2015 Pages: 107 - 121

14. A functional equation with involution related to the cosine function

    • Allison M. Perkins
    • Prasanna K. Sahoo

    OriginalPaper 26 June 2015 Pages: 123 - 131

15. Additive iterative roots of identity and Hamel bases

    • Wojciech Jabłoński

    OriginalPaper Open access 13 October 2015 Pages: 133 - 145

16. A 0–1 law for multiplicative functional equations

    • Antal Járai

    OriginalPaper 22 February 2016 Pages: 147 - 161

17. Stability of functional equations connected with quadrature rules

    • Tomasz Szostok

    OriginalPaper Open access 25 February 2016 Pages: 163 - 172

18. The Hahn–Banach theorem almost everywhere

    • Roman Badora

    OriginalPaper Open access 28 July 2015 Pages: 173 - 179

19. On Sahoo–Riedel equations again

    • Joanna Ger

    OriginalPaper Open access 05 August 2015 Pages: 181 - 191

20. Characterizations of higher-order convexity properties with respect to Chebyshev systems

    • Zsolt Páles
    • Éva Székelyné Radácsi

    OriginalPaper 24 October 2015 Pages: 193 - 210

21. From a theorem of R. Ger and T. Kochanek to marginal joints of means

    • Zoltán Daróczy
    • Justyna Jarczyk
    • Witold Jarczyk

    OriginalPaper Open access 14 November 2015 Pages: 211 - 233

22. Functions on semigroups with vanishing finite Cauchy differences

    • Lin Li
    • Che Tat Ng

    OriginalPaper 28 January 2016 Pages: 235 - 247

23. In some symmetric spaces monotonicity properties can be reduced to the cone of rearrangements

    • Henryk Hudzik
    • Radosław Kaczmarek
    • Miroslav Krbec

    OriginalPaper 12 November 2015 Pages: 249 - 261

24. Normal forms of functional-differential equations of Beardon type and Briot–Bouquet type equations in the complex domain

    • Ludwig Reich
    • Jörg Tomaschek

    OriginalPaper 06 January 2016 Pages: 263 - 270