Dimostriamo l'esistenza della soluzione globale per un sistema di equazioni delle onde con nonlinearità quadratica dipendente dalle variabili spazio-tempo. Come in [3] la tecnica è basata sulla trasformazione di Penrose.
@article{BUMI_2000_8_3B_1_135_0, author = {Nickolay Tzvetkov}, title = {Remark on the null-condition for the nonlinear wave equation}, journal = {Bollettino dell'Unione Matematica Italiana}, volume = {3-A}, year = {2000}, pages = {135-145}, zbl = {0949.35090}, mrnumber = {1755705}, language = {en}, url = {http://dml.mathdoc.fr/item/BUMI_2000_8_3B_1_135_0} }
Tzvetkov, Nickolay. Remark on the null-condition for the nonlinear wave equation. Bollettino dell'Unione Matematica Italiana, Tome 3-A (2000) pp. 135-145. http://gdmltest.u-ga.fr/item/BUMI_2000_8_3B_1_135_0/
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