Rayleigh principle for linear Hamiltonian systems without controllability
Rayleigh principle for linear Hamiltonian systems without controllability
复制标题
无可控线性哈密顿系统的瑞利原理
DOI:
10.1051/cocv/2011104
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发表时间:
2012
期刊:
影响因子:
--
通讯作者:
R. Šimon Hilscher
中科院分区:
文献类型:
--
作者:
W. Kratz;R. Šimon Hilscher
In this paper we consider linear Hamiltonian differential systems without the controllability (or normality) assumption. We prove the Rayleigh principle for these systems with Dirichlet boundary conditions, which provides a variational characterization of the finite eigenvalues of the associated self-adjoint eigenvalue problem. This result generalizes the traditional Rayleigh principle to possibly abnormal linear Hamiltonian systems. The main tools are the extended Picone formula, which is proven here for this general setting, results on piecewise constant kernels for conjoined bases of the Hamiltonian system, and the oscillation theorem relating the number of proper focal points of conjoined bases with the number of finite eigenvalues. As applications we obtain the expansion theorem in the space of admissible functions without controllability and a result on coercivity of the corresponding quadratic functional.
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