Abstract
For a multidimensional hyperbolic equation with a wave operator in the principal part, we show that the Darboux–Protter spectral problem has the countable set of eigenfunctions, and its dual problem is the Volterra problem.
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Aldashev, S.A. Darboux–Protter Spectral Problems for One Class of Multidimensional Hyperbolic Equations. Ukrainian Mathematical Journal 55, 126–135 (2003). https://doi.org/10.1023/A:1025028804123
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DOI: https://doi.org/10.1023/A:1025028804123