1. Toposes for semigroups: an invitation

   • Jonathon Funk
   • Pieter Hofstra

   SURVEY 01 September 2021 Pages: 715 - 776

2. Ellis semigroupoid

   • Massoud Amini
   • Farid Behrouzi

   RESEARCH ARTICLE 28 June 2021 Pages: 777 - 790

3. Spectrum and convergence of eventually positive operator semigroups

   • Sahiba Arora
   • Jochen Glück

   Research Article Open access 26 July 2021 Pages: 791 - 811

4. Cyclotomic numerical semigroup polynomials with at most two irreducible factors

   • Alessio Borzì
   • Andrés Herrera-Poyatos
   • Pieter Moree

   RESEARCH ARTICLE Open access 07 June 2021 Pages: 812 - 828

5. Proportionally modular numerical semigroups generated by arithmetic progressions

   • Edgar Federico Elizeche
   • Amitabha Tripathi

   RESEARCH ARTICLE 17 August 2021 Pages: 829 - 847

   

6. Trace- and pseudo-products: restriction-like semigroups with a band of projections

   • D. G. FitzGerald
   • M. K. Kinyon

   Research Article 14 August 2021 Pages: 848 - 866

7. On the Ellis semigroup of a discrete dynamical system ([0, 1], f)

   • S. García-Ferreira
   • I. Vidal-Escobar

   Research Article 01 September 2021 Pages: 867 - 878

8. Abundant semigroup algebras which are Azumaya

   • Junying Guo
   • Xiaojiang Guo

   RESEARCH ARTICLE 24 July 2021 Pages: 879 - 887

9. Algebraic products of tensor products

   • Neil Hindman
   • Dona Strauss

   Research Article 19 August 2021 Pages: 888 - 898

   

10. Coefficient rings of numerical semigroup algebras

    • I-Chiau Huang
    • Raheleh Jafari

    Research Article 25 August 2021 Pages: 899 - 915

11. Hypercyclic sequences of weighted translations on hypergroups

    • Vishvesh Kumar
    • Seyyed Mohammad Tabatabaie

    RESEARCH ARTICLE 26 August 2021 Pages: 916 - 934

12. Infinite sequences of almost symmetric non-Weierstrass numerical semigroups

    • Jiryo Komeda

    Research Article Open access 11 October 2021 Pages: 935 - 952

13. On Ehresmann semigroups

    • Mark V. Lawson

    RESEARCH ARTICLE 04 June 2021 Pages: 953 - 965

14. Endotypes of partial equivalence relations

    • Yurii Zhuchok
    • Olena Toichkina

    RESEARCH ARTICLE 08 October 2021 Pages: 966 - 975

15. The solution of an open problem on semigroup inclusion classes

    • Maria Leonor Araújo
    • Maria Teresa Araújo
    • Michael Kinyon

    SHORT NOTE 20 August 2021 Pages: 976 - 981

16. RETRACTED ARTICLE: Function spaces and compact semigroups associated with oids

    • A. M. Aminpour
    • Mehrdad Seilani

    RESEARCH ARTICLE Open access 19 November 2015 Pages: 982 - 982