Geodesic
A method for calculating invariant subspaces of symmetric hyperbolic equations
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 46 (2006) no. 6, pp. 1019-1031 
S. K. Godunov; V. T. Zhukov; O. B. Feodoritova. A method for calculating invariant subspaces of symmetric hyperbolic equations. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 46 (2006) no. 6, pp. 1019-1031. http://geodesic.mathdoc.fr/item/ZVMMF_2006_46_6_a5/
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     title = {A~method for calculating invariant subspaces of symmetric hyperbolic equations},
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Voir la notice de l'article provenant de la source Math-Net.Ru

An algorithm is constructed for calculating invariant subspaces of symmetric hyperbolic systems arising in electromagnetic, acoustic, and elasticity problems. Discrete approximations are calculated for subspaces that correspond to minimal eigenvalues and smooth eigenfunctions. Difficulties related to the presence of an infinite-dimensional kernel in the differential operator are successfully handled. The efficiency of the algorithm is demonstrated using acoustics equations.

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