We show that there exists a countable set of eigenfunctions of the Tricomi spectral problem for multidimensional mixed hyperbolic–parabolic equations.
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Translated from Ukrains’kyi Matematychnyi Zhurnal, Vol. 62, No. 6, pp. 723 – 732, June, 2010.
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Aldashev, S.A. Existence of eigenfunctions of the Tricomi spectral problem for some classes of multidimensional mixed hyperbolic–parabolic equations. Ukr Math J 62, 835–846 (2010). https://doi.org/10.1007/s11253-010-0394-7
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DOI: https://doi.org/10.1007/s11253-010-0394-7