On non-monotonicity height of piecewise monotone functions Yingying ZengLin Li OriginalPaper 19 March 2021 Pages: 401 - 414
The forward order laws for the core inverse Tingting LiDijana MosićJianlong Chen OriginalPaper 25 March 2021 Pages: 415 - 431
A note on the Choquet type operators Sorin G. GalConstantin P. Niculescu OriginalPaper 11 April 2021 Pages: 433 - 447
Convexity properties of functions defined on metric Abelian groups Włodzimierz FechnerZsolt Páles OriginalPaper Open access 25 August 2020 Pages: 449 - 481
Gradual transitivity in orthogonality spaces of finite rank Thomas Vetterlein OriginalPaper Open access 30 September 2020 Pages: 483 - 503
The archetypal equation and its solutions attaining the global extremum Mariusz Sudzik OriginalPaper Open access 03 December 2020 Pages: 505 - 526
Alienation of Cauchy’s and the quadratic functional equations on semigroups Brahim Fadli OriginalPaper 19 March 2021 Pages: 527 - 534
Wilson’s functional equation with an anti-endomorphism M. AyoubiD. ZeglamiY. Aissi ReviewPaper 25 August 2020 Pages: 535 - 549
Finite dimensional varieties on hypergroups László SzékelyhidiŻywilla Fechner OriginalPaper Open access 01 February 2021 Pages: 551 - 567
Completely monotonic ratios of basic and ordinary gamma functions Christian BergAsena ÇetinkayaDmitrii Karp OriginalPaper 02 January 2021 Pages: 569 - 588
Center-like subsets in prime rings with derivations and endomorphisms O. Ait ZemzamiL. OukhtiteH. E. Bell OriginalPaper 27 February 2021 Pages: 589 - 598
Correction to: Embeddability of pairs of weighted quasi-arithmetic means into a semiflow Dorota GłazowskaJustyna JarczykWitold Jarczyk Correction 05 April 2021 Pages: 599 - 600