Geodesic
Differential Operators Symmetric with Respect to an Indefinite Metric
Matematičeskie zametki, Tome 89 (2011) no. 6, pp. 846-855.

Voir la notice de l'article provenant de la source Math-Net.Ru

We describe classes of second-order differential operators on a circle that are symmetric with respect to an indefinite metric with a finite rank of indefiniteness.
Keywords: differential operator, complex Hilbert space, $J$-symmetric operator, indefinite metric, periodic function, Pontryagin space, Krein space. 
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R. S. Ismagilov; Sh. Sh. Sultanov. Differential Operators Symmetric with Respect to an Indefinite Metric. Matematičeskie zametki, Tome 89 (2011) no. 6, pp. 846-855. http://geodesic.mathdoc.fr/item/MZM_2011_89_6_a4/

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