— 596 — 



et, par suite, 



A % = Л > 0. 



Considerons, enfin, le coefficient 



l 



on г 2 U 

 (11) A, = — y J p(x) <\>(x)dx = g" 



0 



oii Ton a pose 



l 



о 



Si Г on pose ensuite 



К = (x) ty(x)dx. 



a = jp(x) [-<\>(x)]dx > 0, & = JV(*) W*) dx > °> 

 о 



c = U(a;) [-ф(ж)] > 0, d= jp(x) ty{x)'dx > 0, 



1 1 



2 * 



on pent ecrire 



К = b — a 0 — c. 

 Posons maintenaut, pour abrSger, 



(i2) |+(*) = m = 7 — о £ 



On obtient 



4І ж 4 5 ж - 



