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arXiv 1003.0343math.DS
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三维Hamilton结构的存在性

Existence of Hamiltonian Structure in 3D

H. Gumral

摘要:

在三维空间中,双Hamilton结构的构造可归结为以Frenet-Serret标架的弧长坐标为自变量的Riccati方程的解。守恒量的显式积分与Riccati方程的系数有关,Riccati方程的系数是第三上同调类的元素。当这个类和第一类一起消失时,所有明确构造的双哈密顿系统的例子都被穷尽了。后一个条件为哈密顿函数的显式积分提供了积分因子。对于Darboux-Hegenen系统,Godbillon-Vey不变量是积分因子可积性的障碍.

英文摘要:

In three dimensions, the construction of bi-Hamiltonian structure can be reduced to the solutions of a Riccati equation with the arclength coordinate of a Frenet-Serret frame being the independent variable. Explicit integration of conserved quantities are connected with the coefficients of Riccati equation which are elements of the third cohomology class. All explicitly constructed examples of bi-Hamiltonian systems are exhausted when this class along with the first one vanishes. The latter condition provides integrating factor for explicit integration of Hamiltonian functions. For the Darboux-Halphen system, the Godbillon-Vey invariant is shown to arise as obstruction to integrability of integrating factor.

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