1. Invariance of means

   • Justyna Jarczyk
   • Witold Jarczyk

   OriginalPaper Open access 10 July 2018 Pages: 801 - 872

2. M-affine functions composing Sturm–Liouville families

   • Lucio R. Berrone
   • Gerardo E. Sbérgamo

   OriginalPaper 21 August 2018 Pages: 873 - 910

3. Generalized convolutions and the Levi-Civita functional equation

   • J. K. Misiewicz

   OriginalPaper Open access 13 July 2018 Pages: 911 - 933

4. A note on functional equations connected with the Cauchy mean value theorem

   • Radosław Łukasik

   OriginalPaper Open access 12 July 2018 Pages: 935 - 947

5. Conics in Minkowski geometries

   • Árpád Kurusa

   OriginalPaper 09 August 2018 Pages: 949 - 961

6. Inverse ambiguous functions on some finite non-abelian groups

   • David Schmitz
   • Katherine Gallagher

   OriginalPaper 13 March 2018 Pages: 963 - 973

7. Remarks on solutions to a generalization of the radical functional equations

   • Janusz Brzdęk
   • Jens Schwaiger

   OriginalPaper Open access 15 June 2018 Pages: 975 - 991

8. On Banach–Mazur distance between planar convex bodies

   • Serhii Brodiuk
   • Nazarii Palko
   • Andriy Prymak

   OriginalPaper 09 May 2018 Pages: 993 - 1000