Perturbation of purely imaginary eigenvalues of Hamiltonian matrices under structured perturbations.
Mehrmann, Volker, Xu, Hongguo (2008)
ELA. The Electronic Journal of Linear Algebra [electronic only]
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Displaying similar documents to “The HELP inequality for Hamiltonian systems.”
Perturbation of purely imaginary eigenvalues of Hamiltonian matrices under structured perturbations.
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The first and the second Painlevé equations are explicitly Hamiltonian with time dependent Hamilton function. By a natural extension of the phase space one gets corresponding autonomous Hamiltonian systems in ℂ⁴. We prove that the latter systems do not have any additional algebraic first integral. In the proof equations in variations with respect to a parameter are used.
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Discussiones Mathematicae Graph Theory
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In 1980 Bondy [2] proved that a (k+s)-connected graph of order n ≥ 3 is traceable (s = −1) or Hamiltonian (s = 0) or Hamiltonian-connected (s = 1) if the degree sum of every set of k+1 pairwise nonadjacent vertices is at least ((k+1)(n+s−1)+1)/2. It is shown in [1] that one can allow exceptional (k+ 1)-sets violating this condition and still implying the considered Hamiltonian property. In this note we generalize this result for s = −1 and s = 0 and graphs that fulfill a certain connectivity...
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Friedrichs extension of operators defined by linear Hamiltonian systems on unbounded interval
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Mathematica Bohemica
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In this paper we consider a linear operator on an unbounded interval associated with a matrix linear Hamiltonian system. We characterize its Friedrichs extension in terms of the recessive system of solutions at infinity. This generalizes a similar result obtained by Marletta and Zettl for linear operators defined by even order Sturm-Liouville differential equations.