Some remarks concerning weakly disconjugate linear Hamiltonian systems,

with Roberta Fabbri, Russell Johnson and Sylvia Novo,
J. Math. Anal. Appl.  380 (2011), 853-864.



We study properties of weakly disconjugate linear Hamiltonian systems. We characterize
this concept in terms of a nonoscillation condition. We then show how to approximate a
weakly disconjugate system by one with an exponential dichotomy.




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