?) 3 ) pour leprobì eme (4.14), (4.15) est presque identiquè ,
u ? ? 1 ?u) appartientàappartient`appartientà L ? (0, T ; H 1 (?) 3 ) et, par suite du Lemme II.3.1, cela implique que u est dans L ? (0, T, Nous avons démontré le théorème suivant ,
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