supported by the Agencia Estatal de Investigación grant PID2019-104658GB-I00;the H2020 European Research Council grant MSCA-RISE-2017-777911;AGAUR(Generalitat de Catalunya)grant 2021SGR00113;the Reial Acadèmia de Ciències i Arts de Barcelona;supported by FCT/Portugal through CAMGSD,IST-ID,projects UIDB/04459/2020 and UIDP/04459/2020.
The differential systemẋ=ax−yz,ẏ=−by+xz,ż=−cz+x2,where a,b and c are positive real parameters,has been studied numerically due to the big variety of strange attractors that it can exhibit.This system has a Darboux inv...
supported by the National Natural Science Foundation of China(No.12061016);the Project for Enhancing Young and Middle-aged Teacher’s Research Basis Ability in Colleges of Guangxi(No.2024KY0814)。
In this paper the centers and limit cycles for a class of three-dimensional cubic Kukles systems are investigated.First,by calculating and analyzing the common zeros of the first ten singular point quantities,the nece...
supported by the National Natural Science Foundation of China (Grant Nos.12175111,11931107 and 12171474);NSFC-RFBR (Grant No.12111530003)。
In this paper,we study the N=2a=1 supersymmetric KdV equation.We construct its Darboux transformation and the associated B?cklund transformation.Furthermore,we derive a nonlinear superposition formula,and as applicati...
Based on the Harmonitor theory of field in PCFs in which the second order differential to the transmission distance is included, and by the Darboux solution, the dispersion effect on the field is re-discussed. The res...
Supported by the National Natural Science Foundation of China(Grant No.61473059)。
Consider SE(3)as a submanifold of the Euclidean space E12.At first,the intrinsic and extrinsic geometries of SE(3)are studied.Then the Frenet typed equations for curves in SE(3)are derived.The relationship between the...