Phase-isometries between two \(\ell ^p(\Gamma , H)\)-type spaces Xianhua ZengXujian Huang OriginalPaper 06 May 2020 Pages: 793 - 802
The homomorphism equation on semilattices Lucio R. Berrone OriginalPaper 11 January 2020 Pages: 803 - 816
Optimal bounds for the tangent and hyperbolic sine means Monika NowickaAlfred Witkowski OriginalPaper Open access 14 January 2020 Pages: 817 - 827
Geometry on the lines of polar spine spaces Krzysztof PetelczycKrzysztof PrażmowskiMariusz Żynel OriginalPaper Open access 27 June 2020 Pages: 829 - 846
Geometric properties of discontinuous fixed point set of (\(\varvec{\epsilon -\delta }\)) contractions and applications to neural networks Ravindra Kishor BishtNihal Özgür OriginalPaper 20 September 2019 Pages: 847 - 863
Some monotonicity properties in F-normed Musielak–Orlicz spaces Radosław Kaczmarek OriginalPaper Open access 13 November 2019 Pages: 865 - 885
On a certain adaptive method of approximate integration and its stopping criterion Szymon Wąsowicz OriginalPaper Open access 17 April 2020 Pages: 887 - 898
On the Ulam–Hyers stability of the complex functional equation \(\varvec{F(z)+F(2z)+\cdots +F(nz)=0}\) G. GarcíaG. Mora OriginalPaper 20 November 2019 Pages: 899 - 911
A generalization of d’Alembert’s other functional equation on semigroups Omar AjebbarElhoucien Elqorachi OriginalPaper 30 November 2019 Pages: 913 - 930
Sections in functional equations Dan M. DăianuCristina Mîndruţă OriginalPaper 03 June 2020 Pages: 931 - 943
Packing colorings of subcubic outerplanar graphs Boštjan BrešarNicolas GastineauOlivier Togni OriginalPaper 28 April 2020 Pages: 945 - 967
Angular measures and Birkhoff orthogonality in Minkowski planes Márton NaszódiVilmos ProkajKonrad Swanepoel OriginalPaper Open access 22 February 2020 Pages: 969 - 977
Approximate n-idempotents and generalized Aluthge transform Mohammad Sal Moslehian OriginalPaper 14 February 2020 Pages: 979 - 987
Ulam-stability of a generalized linear functional equation, a fixed point approach Chaimaa BenzaroualaLahbib Oubbi OriginalPaper 17 January 2020 Pages: 989 - 1000