On Convex Bodies that are Characterizable by Volume Function Ákos G. Horváth Problem Contribution Open access 23 January 2020 Pages: 1 - 20
Invariants of Graph Drawings in the Plane A. Skopenkov Research Exposition 13 February 2020 Pages: 21 - 55
Protecting Billiard Balls From Collisions Jayadev AthreyaKrzysztof Burdzy Research Contribution 10 February 2020 Pages: 57 - 62
The Roots of Exceptional Modular Lie Superalgebras with Cartan Matrix Sofiane BouarroudjDimitry LeitesJin Shang Research Contribution 20 March 2020 Pages: 63 - 118
Ramanujan’s Theorem and Highest Abundant Numbers Oleg R. Musin Research Contribution 14 April 2020 Pages: 119 - 130
Two Parameters bt-Algebra and Invariants for Links and Tied Links F. AicardiJ. Juyumaya Research Contribution 02 April 2020 Pages: 131 - 148