Geodesic
The existence of a linear third-order equation with a countable frequency spectrum
Trudy Seminara im. I.G. Petrovskogo, Trudy Seminara imeni I. G. Petrovskogo, Tome 30 (2014) no. 30, pp. 242-251 Cet article a éte moissonné depuis la source Math-Net.Ru

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We construct a nonautonomous homogeneous linear third-order equation with the following property: the set of characteristic frequencies of zeroes of its solutions contains a countable set of distinct essential (i.e., taken on a set or positive measure in the space of solutions) values. 
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M. V. Smolentsev. The existence of a linear third-order equation with a countable frequency spectrum. Trudy Seminara im. I.G. Petrovskogo, Trudy Seminara imeni I. G. Petrovskogo, Tome 30 (2014) no. 30, pp. 242-251. http://geodesic.mathdoc.fr/item/TSP_2014_30_30_a13/

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