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О ЧАСТОТНОМ СПЕКТРЕ ТОЧНЫХ РЕШЕНИЙ УРАВНЕНИЙ ДВУМЕРНОЙ ГИДРОДИНАМИКИ

Абрашкин А. А., Якубович Е. И.

It is shown that the discrete frequency spectrum of the plane hydrodynamic flow of an ideal incompressible liquid with localized trajectories of liquid particles can contain only one harmonic, two harmonics, or an infinite number of the latter.