1. Relative Growth in Hyperbolic Groups

   • Stephen Cantrell
   • Richard Sharp

   OriginalPaper Open access 27 January 2021 Pages: 1 - 13

2. The \(R_\infty \) property for pure Artin braid groups

   • Karel Dekimpe
   • Daciberg Lima Gonçalves
   • Oscar Ocampo

   OriginalPaper 10 February 2021 Pages: 15 - 33

   

3. On wave-breaking phenomena for a new generalized two-component shallow water wave system

   • Xiaofang Dong

   OriginalPaper 24 October 2020 Pages: 35 - 53

4. Keplerian trigonometry

   • Alessandro Gambini
   • Giorgio Nicoletti
   • Daniele Ritelli

   OriginalPaper Open access 28 January 2021 Pages: 55 - 72

   

5. \(k-\)Fibonacci powers as sums of powers of some fixed primes

   • Carlos A. Gómez
   • Jhonny C. Gómez
   • Florian Luca

   OriginalPaper 13 February 2021 Pages: 73 - 105

6. On the reducibility of systems of two linear first-order ordinary differential equations

   • G. A. Grigorian

   OriginalPaper 20 January 2021 Pages: 107 - 117

7. Logarithmic integrals, zeta values, and tiered binomial coefficients

   • Michael E. Hoffman
   • Markus Kuba

   OriginalPaper 12 February 2021 Pages: 119 - 154

8. Dispersion of digital (0, m, 2)-nets

   • Ralph Kritzinger

   OriginalPaper 07 February 2021 Pages: 155 - 171

9. A note on pronormal p-subgroups of finite groups

   • Suli Liu
   • Haoran Yu

   OriginalPaper 16 November 2020 Pages: 173 - 176

10. Comments on “Flag-transitive block designs and unitary groups”

    • Xiaoqin Zhan
    • Suyun Ding

    OriginalPaper 06 January 2021 Pages: 177 - 180

11. Book reviews

    News 15 April 2021 Pages: 181 - 182