1. On Weakly P-Ehresmann Semigroups

   • S.-F. Wang
   • Q.-F. Yan

   OriginalPaper 10 February 2021 Pages: 335 - 362

2. Hereditary Torsion Theories for Graphs

   • S. Veldsman

   OriginalPaper 10 February 2021 Pages: 363 - 378

3. Double weakness

   • S. Garti
   • S. Shelah

   OriginalPaper 09 February 2021 Pages: 379 - 391

4. The arcsine law on divisors in arithmetic progressions modulo prime powers

   • B. Feng
   • J. Wu

   OriginalPaper 29 November 2020 Pages: 392 - 406

5. On products of consecutive arithmetic progressions. III

   • Y. Zhang

   OriginalPaper 30 November 2020 Pages: 407 - 428

6. On Sjölin–Soria–Antonov type extrapolation for locally compact groups and a.e. convergence of Vilenkin–Fourier series

   • G. Oniani

   OriginalPaper 30 November 2020 Pages: 429 - 436

7. A generalization of simplest number fields and their integral basis

   • L. Remete

   OriginalPaper 28 November 2020 Pages: 437 - 461

8. Classification Of Uniform Flag Triangulations Of The Boundary Of The Full Root Polytope Of Type A

   • R. Ehrenborg
   • G. Hetyei
   • M. Readdy

   OriginalPaper 29 November 2020 Pages: 462 - 511

9. Minimal reductions and core of ideals in pullbacks

   • S. Kabbaj
   • A. Mimouni

   OriginalPaper 06 February 2021 Pages: 512 - 529

10. A note on perfect packing of squares and cubes

    • J. Januszewski
    • Ł. Zielonka

    OriginalPaper 06 February 2021 Pages: 530 - 537

11. On some 2-edge-connected homogenous graphs and Cayley graphs with two removable vertices

    • J. Mycielski
    • G. Tomkowicz

    OriginalPaper 06 February 2021 Pages: 538 - 546

12. On the volume of hyperplane sections of a d-cube

    • I. Aliev

    OriginalPaper 30 June 2020 Pages: 547 - 551

13. A sharp oscillation criterion for second-order half-linear advanced differential equations

    • G. E. Chatzarakis
    • S. R. Grace
    • I. Jadlovská

    OriginalPaper 06 February 2021 Pages: 552 - 562

14. On the best Ulam constant of a first order linear difference equation in Banach spaces

    • A.-R. Baias
    • F. Blaga
    • D. Popa

    OriginalPaper 28 November 2020 Pages: 563 - 575

15. Expansions in multiple bases

    • Y.-Q. Li

    OriginalPaper 28 November 2020 Pages: 576 - 600

16. On a kind of self-similar sets with complete overlaps

    • D. Kong
    • Y. Yao

    OriginalPaper 06 February 2021 Pages: 601 - 622

17. Distribution of the logarithmic derivative of a rational function on the line

    • M. A. Komarov

    OriginalPaper 29 November 2020 Pages: 623 - 639

18. Strongly self-dual polytopes and distance graphs in the unit sphere

    • Á. G. Horváth

    OriginalPaper 29 November 2020 Pages: 640 - 651

19. Minimum degree and diversity in intersecting antichains

    • P. Frankl

    OriginalPaper 28 November 2020 Pages: 652 - 662

20. Algebraic commutators with respect to subnormal subgroups in division rings

    • M. H. Bien
    • B. X. Hai
    • V. M. Trang

    OriginalPaper 06 February 2021 Pages: 663 - 681