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 
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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     title = {Indexing of eigenvalues of boundary value problems for {Hamiltonian} systems of ordinary differential equations},
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Voir la notice de l'article provenant de la source Math-Net.Ru

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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