Geodesic
Indexing of eigenvalues of boundary value problems for Hamiltonian systems of ordinary differential equations
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 54 (2014) no. 3, pp. 425-429
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For a self-adjoint spectral boundary value problem for a linear Hamiltonian system of ordinary differential equations, an indexing of the eigenvalues is found that is invariant under smooth variations in the parameters of the problem. 
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S. V. Kurochkin. Indexing of eigenvalues of boundary value problems for Hamiltonian systems of ordinary differential equations. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 54 (2014) no. 3, pp. 425-429. http://geodesic.mathdoc.fr/item/ZVMMF_2014_54_3_a6/

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