1. The Frobenius problem for numerical semigroups generated by sequences of the form \(ca^n-d\)

   • Fabián Arias
   • Jerson Borja
   • Calixto Rhenals

   RESEARCH ARTICLE 02 October 2023 Pages: 581 - 608

2. The local bisection hypothesis for twisted groupoid C*-algebras

   • Becky Armstrong
   • Jonathan H. Brown
   • Jacqui Ramagge

   RESEARCH ARTICLE Open access 17 October 2023 Pages: 609 - 623

3. Moment functions of higher rank on some types of hypergroups

   • Żywilla Fechner
   • Eszter Gselmann
   • László Székelyhidi

   RESEARCH ARTICLE Open access 11 December 2023 Pages: 624 - 636

4. An extension to “A subsemigroup of the rook monoid”

   • George Fikioris
   • Giannis Fikioris

   RESEARCH ARTICLE Open access 19 October 2023 Pages: 637 - 650

   

5. Formations of orthodox semigroups

   • Gracinda M. S. Gomes
   • Ana-Catarina C. Monteiro

   RESEARCH ARTICLE 08 November 2023 Pages: 651 - 679

   

6. Normal subsemigroups of finite transformation semigroups

   • Janusz Konieczny

   RESEARCH ARTICLE 25 September 2023 Pages: 680 - 691

   

7. On the structure of semigroups whose regular elements are completely regular

   • Xavier Mary

   RESEARCH ARTICLE 08 November 2023 Pages: 692 - 717

   

8. Joint continuity in semitopological monoids and semilattices

   • Alexander V. Osipov
   • Konstantin Kazachenko

   RESEARCH ARTICLE 04 December 2023 Pages: 718 - 731

9. Limit varieties generated by finite non-J-trivial aperiodic monoids

   • Olga B. Sapir

   RESEARCH ARTICLE 04 December 2023 Pages: 732 - 750

   

10. Ehresmann–Schein–Nambooripad theorems for classes of biunary semigroups

    • Tim Stokes

    RESEARCH ARTICLE Open access 20 September 2023 Pages: 751 - 779

11. Homeomorphism groups on the positive real numbers defined by binary operations

    • Sin-Ei Takahasi

    RESEARCH ARTICLE 08 November 2023 Pages: 780 - 791