1. Nonlocal symmetries of some nonlinear partial differential equations with third-order Lax pairs

   • Xiazhi Hao

   Research Articles 21 June 2021 Pages: 119 - 127

2. Binary Darboux transformation for a negative-order AKNS equation

   • Z. Amjad
   • D. Khan

   Research Articles 21 June 2021 Pages: 128 - 141

   

3. Lie symmetry, nonlocal symmetry analysis, and interaction of solutions of a (2+1)-dimensional KdV–mKdV equation

   • Zhonglong Zhao
   • Lingchao He

   Research Articles 21 June 2021 Pages: 142 - 162

   

4. Novikov equation: Bäcklund transformation and applications

   • Hui Mao

   Research Articles 21 June 2021 Pages: 163 - 173

   

5. Thermodynamics of interacting systems of DNA molecules

   • U. A. Rozikov

   Research Articles 21 June 2021 Pages: 174 - 184

   

6. Weakly periodic Gibbs measures for the Ising model on the Cayley tree of order \(k=2\)

   • M. M. Rakhmatullaev
   • J. D. Dehqonov

   Research Articles 21 June 2021 Pages: 185 - 198

7. Blowup relations on \(\mathbb{C}^2/\mathbb{Z}_2\) from Nakajima–Yoshioka blowup relations

   • A. I. Shchechkin

   Research Articles 21 June 2021 Pages: 199 - 215

   

8. Quasi-solid state microscopic dynamics in equilibrium classical liquids: Self-consistent relaxation theory

   • A. V. Mokshin
   • R. M. Khusnutdinoff
   • B. N. Galimzyanov

   Research Articles 21 June 2021 Pages: 216 - 235

   

9. Dynamics of the Friedmann universe with boundary terms added to the action

   • V. I. Kochkin

   Research Articles 21 June 2021 Pages: 236 - 242