Geodesic
Riemann's method and the characteristic value and cauchy problems for the damped wave equation†
Glasgow mathematical journal, Tome 10 (1969) no. 2, pp. 147-152

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

Riemann's method for solving the Cauchy problem for hyperbolic differential equations in two independent variables has been extended in a number of papers [4], [5], [2] to the wave equation in space of higher dimensions. The method, which consists in the determination of a so-called Riemann function, hinges on the solution of a characteristic value problem. Accordingly, if Riemann's method is to be used in solving a characteristic value problem, one will have to consider another characteristic value problem and thus the process becomes circular. This difficulty was first overcome by Protter [7] in solving the characteristic value problem for the wave equation in three variables. There he employed a variation of Riemann's method developed by Martin [5]. Martin's result was later extended by Diaz and Martin [2] to the wave equation in an arbitrary number of variables. This made it possible to extend Protter's result to the wave equation in space of higher dimensions [8]. 
Young, Eutiquio C. Riemann's method and the characteristic value and cauchy problems for the damped wave equation†. Glasgow mathematical journal, Tome 10 (1969) no. 2, pp. 147-152. doi: 10.1017/S0017089500000707
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