By N. Spaltenstein

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Cela ~ . d) ElEment dens d@fini Si qu'il Mais maximaux ca un contenu G § de = CgTg_l[y) ~ ( g T g -I ] . En y = xtv x 6 G supposer c anonique des -1 = x [ • T' = {x - l t x t - 1 t 6 T} , et cxT'U si est peut d6monstration [tv)x(tv) t- 1 ) , est est un une sous-vari6t@ , alors (e), et sous-tore de T . s xt 6 C / T eussi (y) . C e l a o puisque G/B ({) complete. Soit On , C C/B[y) LEMME. Cs176 res ~ (e) , h 6 NGo(T) t ( x -1 v x v -1 )t -1 6 U B-stable = ( g 6 G~ ) tel donc et (d). d). n'est que normelise r~union ~(CT(y)O) de montre le qui gT c T U par rEsoluble.

Done seulmment c/~ G si . Cmla Q[u] # ~ d@montre . la pro- sont toutes des CG[X] . On CG[U] , on a : ; B - r g x [G] n N) - r g [ G ) dens et B G § dim u x C G dim + dim[V w G Q[u] C/~ a] ~ 2 si @galit@ E = 2 G = dim Pour >" 2 E w = dim il , dim COROLLAIRE. 2] puisque dim 9 at G - rgu{G] O'apr@s position dim tout E # dim Q(c/~ Q(u) # N si a pour w PROPOSITION. Pour Q[u] c~ = seulement at aussi l'une de ; + rgx(G) ces relats e]l es @galit@s. 10] J dim suffit de x at donc soit 6H [H] U + rgu CH(U] = CG(X] de consid@rer H = CG(S) et dim , on [a).

Que Cela C1 = C o Si xu u 6 x est Si x +6(1)U 4 et & xu 2 , u 6 U3 est b fl + b 2 + b 3 = 0 bI = b2 = b3 = 0 (t)xB[t)x en Y encore cile volr tel que u 6X +6+y+~X el# 0 , xu n'est pas +6[1) Soit cI + c2 + c3 # 0 , on cI = o3 = 0 t , En 1) est convenable, xu 6 C2 peut on Oonc existe est xu tel peut dense = xu2 . il existe . Par contenu u3 = x & xu 3 par consequent . On a +6+y+2611) n 6 NGo[T) dans bI + b2 + b3 = 0 un t' donc @l@ment CO u CI u C2 u C3 et on I1 est dans faN xu G C 2 on peut d'abord done soit de C3 = ~/G[XU3 X_BS.

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