2 papers
math.DS2000
The Center Variety of Polynomial Differential Systems
Abdul Salam Jarrah, Reinhard Laubenbacher, Valery Romanovski
We investigate the symmetry component of the center variety of polynomial differential systems, corresponding to systems with an axis of symmetry in the real plane. We give a gener…
nlin.CD2000
On WKB Series for the Radial Kepler Problem
Valery Romanovski, Marko Robnik
We obtain the rigorous WKB expansion to all orders for the radial Kepler problem, using the residue calculus in evaluating the WKB quantization condition in terms of a complex cont…