pour la norme de 1f.; ce qui impose déjà que ayx E HI(O, 1), i.e. y E H 2 (0, 1), z E HI(O, 1), u = z(O) ,
-li z( ayx)x dx -li ayxzx dx -u[ayx(O) + ,
O, 1) X HI(O, 1) X JR.2, avec u = z(O), et v = z(I) ,
avecu = z(O), et v = z(I), i.e.: llzxaYx-(JCz(O) = 0 ,
Il (1'? + aY;) dx + me + Mij2] + l' g(s)Y/(O,s) dsl :<::: c te ,
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