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Si studia un problema di Cauchy caratteristico (per un operatore di cui quello di Klein-Gordon, in coordinate cono luce, è un modello). Si stabiliscono teoremi di esistenza ed unicità. Si prova che la velocità di propagazione è infinita.
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Bassanelli, G. On a characteristic Cauchy problem. Annali di Matematica pura ed applicata 147, 343–362 (1987). https://doi.org/10.1007/BF01762423
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DOI: https://doi.org/10.1007/BF01762423