Lax, Peter D. The multiplicity of eigenvalues. (English) Zbl 0483.15006 Bull. Am. Math. Soc., New Ser. 6, 213-214 (1982). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 18 Documents MSC: 15A18 Eigenvalues, singular values, and eigenvectors 35L40 First-order hyperbolic systems 57R99 Differential topology Keywords:pencil; symmetric matrices; hyperbolic PDE; characteristic; multiple real eigenvalue PDFBibTeX XMLCite \textit{P. D. Lax}, Bull. Am. Math. Soc., New Ser. 6, 213--214 (1982; Zbl 0483.15006) Full Text: DOI References: [1] Fritz John, Restrictions on the coefficients of hyperbolic systems of partial differential equations, Proc. Nat. Acad. Sci. U.S.A. 74 (1977), no. 10, 4150 – 4151. · Zbl 0377.35050 [2] V. Arnold, Les méthodes mathématiques de la mécanique classique, Éditions Mir, Moscow, 1976 (French). Traduit du russe par Djilali Embarek. V. I. Arnol\(^{\prime}\)d, Mathematical methods of classical mechanics, Springer-Verlag, New York-Heidelberg, 1978. Translated from the Russian by K. Vogtmann and A. Weinstein; Graduate Texts in Mathematics, 60. This reference list is based on information provided by the publisher or from digital mathematics libraries. Its items are heuristically matched to zbMATH identifiers and may contain data conversion errors. In some cases that data have been complemented/enhanced by data from zbMATH Open. This attempts to reflect the references listed in the original paper as accurately as possible without claiming completeness or a perfect matching.