1. Locally Hausdorff tight groupoids generalised

   • Tristan Bice
   • Charles Starling

   Research Article 30 March 2021 Pages: 583 - 611

   

2. A network of congruences on an ample semigroup

   • Abdulsalam El-Qallali

   RESEARCH ARTICLE 16 March 2021 Pages: 612 - 654

   

3. Baer sums for a natural class of monoid extensions

   • Peter F. Faul

   Research Article Open access 19 February 2021 Pages: 655 - 673

4. Unique factorization properties in commutative monoid rings with zero divisors

   • J. R. Juett
   • Christopher Park Mooney
   • Rhys D. Roberts

   Research Article 31 March 2021 Pages: 674 - 696

   

5. On bases of identities of finite central locally orthodox completely regular semigroups

   • Jiří Kad’ourek

   Research Article 16 March 2021 Pages: 697 - 724

   

6. Congruences on quasi completely regular semirings

   • S. K. Maity
   • R. Ghosh

   RESEARCH ARTICLE 05 April 2021 Pages: 725 - 736

7. Commutative semigroups whose endomorphisms are power functions

   • Ryszard Mazurek

   Research Article Open access 24 March 2021 Pages: 737 - 755

8. Ideal Connes amenability of \(l^{1}\)-Munn algebras and its application to semigroup algebras

   • Ahmad Minapoor

   RESEARCH ARTICLE 11 March 2021 Pages: 756 - 764

9. An extension of the Rådström cancellation theorem to cornets

   • Gábor M. Molnár
   • Zsolt Páles

   Research Article Open access 15 March 2021 Pages: 765 - 793

10. On covers of acts over monoids with condition \((PF'')\) and envelopes of S-acts

    • Husheng Qiao
    • Tingting Zhao

    RESEARCH ARTICLE 20 April 2021 Pages: 794 - 808

    

11. \(\aleph _0\)-categoricity of semigroups II

    • Thomas Quinn-Gregson

    RESEARCH ARTICLE Open access 10 December 2020 Pages: 809 - 841

    

12. Morita equivalence of finite semigroups

    • Ülo Reimaa
    • Valdis Laan
    • Lauri Tart

    Research Article 07 January 2021 Pages: 842 - 860

    

13. Abelian and symmetric generalized digroups

    • José Gregorio Rodríguez-Nieto
    • Olga P. Salazar-Díaz
    • Raúl Velásquez

    RESEARCH ARTICLE 02 March 2021 Pages: 861 - 884

    

14. Right-orderability versus left-orderability for monoids

    • Friedrich Wehrung

    RESEARCH ARTICLE 20 April 2021 Pages: 885 - 899

    

15. Uniform stability of a family of resolvent operators in Hilbert spaces

    • Shouguo Zhu
    • Zhenbin Fan
    • Gang Li

    RESEARCH ARTICLE 17 March 2021 Pages: 900 - 915

16. A topological shuttle between inequalities and pseudoinequalities

    • Bernardo H. Fernandes
    • Gracinda M. S. Gomes

    SHORT NOTE 24 February 2021 Pages: 916 - 924

17. On Kovács–Newman ordered semigroups

    • Jonatan Kolegar

    SHORT NOTE 20 April 2021 Pages: 925 - 929