1. Fifty New Invariants of N-Periodics in the Elliptic Billiard

   • Dan Reznik
   • Ronaldo Garcia
   • Jair Koiller

   Problem Contribution 18 February 2021 Pages: 341 - 355

   

2. Integrability of Point-Vortex Dynamics via Symplectic Reduction: A Survey

   • Klas Modin
   • Milo Viviani

   Research Contribution Open access 15 October 2020 Pages: 357 - 385

   

3. On the Density of Dispersing Billiard Systems with Singular Periodic Orbits

   • Otto Vaughn Osterman

   Research Contribution 21 April 2021 Pages: 387 - 406

   

4. Interpolation of Weighted Extremal Functions

   • Alexander Rashkovskii

   Research Contribution Open access 16 March 2021 Pages: 407 - 417

5. The Yomdin–Gromov Algebraic Lemma Revisited

   • Gal Binyamini
   • Dmitry Novikov

   Research Contribution 03 May 2021 Pages: 419 - 430

6. Inflation of Poorly Conditioned Zeros of Systems of Analytic Functions

   • Michael Burr
   • Anton Leykin

   Research Contribution 27 May 2021 Pages: 431 - 440

   

7. Conjectures on Stably Newton Degenerate Singularities

   • Jan Stevens

   Research Contribution Open access 07 June 2021 Pages: 441 - 465

   

8. A Galois–Dynamics Correspondence for Unicritical Polynomials

   • Robin Zhang

   Research Contribution 09 June 2021 Pages: 467 - 481

9. Remarks on Joachimsthal Integral and Poritsky Property

   • Maxim Arnold
   • Serge Tabachnikov

   Research Contribution 01 June 2021 Pages: 483 - 491