Geodesic
On the Spectrum of an Odd-Order Differential Operator
Matematičeskie zametki, Tome 101 (2017) no. 5, pp. 643-646.

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

Operators generated by a differential expression on a finite closed interval are considered. It is shown that, for any odd integer $n$, there exist differential operators of order $n$ whose spectrum fills the whole complex plane.
Keywords: eigenvalues, degenerate boundary conditions, odd-order differential equations. 
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A. M. Akhtyamov. On the Spectrum of an Odd-Order Differential Operator. Matematičeskie zametki, Tome 101 (2017) no. 5, pp. 643-646. http://geodesic.mathdoc.fr/item/MZM_2017_101_5_a0/

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