奇异哈密顿微分系统的粘结引理和亏指数

建立了奇异哈密顿微分系统的"粘结"引理,这是H.D.Niessen和A.Zettl关于二阶微分方程相应结果的推广.同时也得到了Rellich和Rosenberger关于二阶微分方程非振动结果在奇异哈密顿微分系统上的推广形式,并由此建立了奇异哈密顿微分系统极限点型判断准则.该结果不但推广了綦、陈的相应结果,包含了S.L.Clark和F.Gesztesy的结果,同时也得到了奇异哈密顿微分系统的Hartman型极限点型判断准则.

Multiple periodic solutions for non-canonical Hamiltonian systems with application to differential delay equations

We first establish Maslov index for non-canonical Hamiltonian system by using symplectic transformation for Hamiltonian system.Then the existence of multiple periodic solutions for the non-canonical Hamiltonian system is obtained by applying the Maslov index and Morse theory.As an application of the results,we study a class of non-autonomous differential delay equation which can be changed to non-canonical Hamiltonian system and obtain the existence of multiple periodic solutions for the equation by employing variational method.