Geodesic
A theorem on polynomial lorentz structures
Glasgow mathematical journal, Tome 28 (1986) no. 2, pp. 229-235

Voir la notice de l'article provenant de la source Cambridge University Press

Let M be a differentiable manifold of dimension m. A tensor field f of type (1, 1) on M is called a polynomial structure on M if it satisfies the equation:where a1, a2, ..., an are real numbers and I denotes the identity tensor of type (1, 1).We shall suppose that for any x ∈ Mis the minimal polynomial of the endomorphism fx: TxM → TxM.We shall call the triple (M, f, g) a polynomial Lorentz structure if f is a polynomial structure on M, g is a symmetric and nondegenerate tensor field of type (0, 2) of signaturesuch that g (fX, fY) = g(X, Y) for any vector fields X, Y tangent to M. The tensor field g is a (generalized) Lorentz metric. 
Deszyński, Krzysztof. A theorem on polynomial lorentz structures. Glasgow mathematical journal, Tome 28 (1986) no. 2, pp. 229-235. doi: 10.1017/S001708950000656X
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