Hyers–Ulam stability for quantum equations Douglas R. AndersonMasakazu Onitsuka OriginalPaper 25 June 2020 Pages: 201 - 214
On the total and strong version for Roman dominating functions in graphs S. Nazari-MoghaddamM. SoroudiI. G. Yero OriginalPaper 28 January 2021 Pages: 215 - 236
A probabilistic method of solving Lobachevsky’s functional equation Michael Mania OriginalPaper 25 March 2020 Pages: 237 - 243
A fixed point theorem for a system of Pachpatte operator equations Erdal KarapınarAli ÖztürkVladimir Rakočević OriginalPaper 14 May 2020 Pages: 245 - 254
Symmetric spectral synthesis Eszter GselmannLászló Székelyhidi OriginalPaper Open access 23 December 2020 Pages: 255 - 279
The small dimension lemma and d’Alembert’s equation on semigroups Henrik Stetkær OriginalPaper 20 August 2020 Pages: 281 - 299
On the Cauchy difference of functions bounded modulo \(\mathbb {Z}\) on “large” sets Eliza Jabłońska OriginalPaper Open access 19 August 2020 Pages: 301 - 308
A note on the g-angle between subspaces of a normed space Muhammad NurHendra Gunawan OriginalPaper 28 July 2020 Pages: 309 - 318
The chromatic number of triangle-free and broom-free graphs in terms of the number of vertices Naoki MatsumotoMinako Tanaka OriginalPaper 27 October 2020 Pages: 319 - 328
On the packing coloring of base-3 Sierpiński graphs and H-graphs Fei DengZehui ShaoAleksander Vesel Manuscript 01 September 2020 Pages: 329 - 341
Continuity of operators intertwining with translation operators on hypergroups Vishvesh KumarRitumoni Sarma OriginalPaper 14 August 2020 Pages: 343 - 349
The weak core inverse D. E. FerreyraF. E. LevisN. Thome OriginalPaper 27 August 2020 Pages: 351 - 373
On increasing iteration semigroup of Jensen set-valued functions Masoumeh Aghajani OriginalPaper 21 February 2021 Pages: 375 - 382
Some trigonometric functional equations on monoids generated by their squares Bruce Ebanks OriginalPaper 19 June 2020 Pages: 383 - 391
Undirecting membership in models of Anti-Foundation Bea Adam-DayPeter J. Cameron OriginalPaper Open access 18 November 2020 Pages: 393 - 400
