Alexander BRUDNYI
The classical Poincar´e Center-Focus problem asks about the characterization of planar polynomial vector fields such that all their integral trajectories are closed curves whose interiors contain a fixed point, a center. This problem is reduced to a center problem for certain ODE . We present an algebraic approach to the center problem based on the study of the group of paths determined by the coefficients of the ODE.
इस लेख का हिस्सा
English 
Spanish 
Chinese 
Russian 
German 
French 
Japanese 
Portuguese 
Telugu 