2 papers
math.DS2021
Topological multiple recurrence of weakly mixing minimal systems for generalized polynomials
Ruifeng Zhang, Jianjie Zhao
Let be a weakly mixing minimal system, be integer-valued generalized polynomials and be non-degenerate. Then there exists a resid…
math-ph2012
Existence of Optical Vortices
Yisong Yang, Ruifeng Zhang
Optical vortices arise as phase singularities of the light fields and are of central interest in modern optical physics. In this paper, some existence theorems are established for…