1. Coextensive varieties via central elements

   • W. J. Zuluaga Botero

   OriginalPaper 05 August 2021 Article: 50

2. Topologies of pointwise convergence in the first order languages and in affine spaces

   • G. Mashevitzky

   OriginalPaper 05 August 2021 Article: 49

3. Another problem of Jónsson and McKenzie from 1982: refinement properties for connected powers of posets

   • Jonathan David Farley

   Mailbox 19 July 2021 Article: 48

   

4. The complexity of homomorphism factorization

   • Kevin M. Berg

   OriginalPaper 12 July 2021 Article: 47

   

5. Constructing illoyal algebra-valued models of set theory

   • Benedikt Löwe
   • Robert Paßmann
   • Sourav Tarafder

   OriginalPaper Open access 25 June 2021 Article: 46

   

6. Equivalence à la Mundici for commutative lattice-ordered monoids

   • Marco Abbadini

   OriginalPaper Open access 25 June 2021 Article: 45

   

7. Equational theories of upper triangular tropical matrix semigroups

   • Bin Bin Han
   • Wen Ting Zhang
   • Yan Feng Luo

   OriginalPaper 19 June 2021 Article: 44

8. Homomorphic images of affine quandles

   • Přemysl Jedlička
   • David Stanovský

   OriginalPaper 14 June 2021 Article: 43

   

9. Semiring identities of the Brandt monoid

   • Mikhail V. Volkov

   Mailbox 05 June 2021 Article: 42

10. On the cardinality of non-isomorphic intermediate rings of C(X)

    • B. Bose
    • S. K. Acharyya

    OriginalPaper 24 May 2021 Article: 41

11. Lattice characterization of finite nilpotent groups

    • Jelena Jovanović
    • Branimir Šešelja
    • Andreja Tepavčević

    OriginalPaper 21 May 2021 Article: 40

    

12. On algebras of binary relations with conjunctive operations

    • Dmitry A. Bredikhin

    OriginalPaper 21 May 2021 Article: 39

13. Reversibility of disconnected structures

    • Miloš S. Kurilić
    • Nenad Morača

    OriginalPaper 13 May 2021 Article: 38

14. Galois connections for bilattices

    • Costas D. Koutras
    • Georgios V. Pitsiladis

    OriginalPaper 12 May 2021 Article: 37