Supported by the National Natural Science Foundation of China(No.11001240,11371323)
Differential-difference equations of the form un = Fn(t, un-1,Un,Unn+1,Un-1,un,Un+1) are clas- sifted according to their intrinsic Lie point symmetries, equivalence group and some low-dimensional Lie algebras incl...
Supported by the National Natural Science Foundation(NSF) of China (11001240);NSF of Zhejiang Province(Y6090359)
We prove some sharp Hardy inequality associated with the gradient △γ=(△x,|x|γ [x△y) by a direct and simple approach. Moreover, similar method is applied to ob- tain some weighted sharp Rellich inequality rela...
Project supported by the National Natural Science Foundation of China for Distinguished Young Scholars (No.10925104);the National Natural Science Foundation of China (No.11001240);the Doctoral Program Foundation of the Ministry of Education of China (No.20106101110008);the Zhejiang Provincial Natural Science Foundation of China (Nos.Y6090359,Y6090383)
In this paper, the dimension of invariant subspaces admitted by nonlinear sys- tems is estimated under certain conditions. It is shown that if the two-component nonlinear vector differential operator F = (F1, F2) wi...