Ngày tải lên :
10/04/2013, 00:41
... 0, i.e (u, en)H = 0, \In = 1 ,2, thl hQ ('€n)n=1 ,2, cd sd la cua H nen u E H.l., VI v~y u = o (c) Gia sit phan chung ding RangeA = £00,thee dinh If anh X9-md (xem [22 ], theoreme II.5, p.1S) thl ... £00 VI khong gian Hilbert H la phan X9-. [22 ], theoreme ( III .29 , p.51), thee b6 d~ se phat bi~u du6'i day thl £00la phan X9-,di~u voly B6 d~ Cha X, Y Lahai khong gian Banach f : X 't Y La anh ... X9d§.n d~n f-1(B') la compact y~u (dinh If Kakutani, [22 ], theoreme III.16, p.44) Hdn nita f cling lien tvc thee cac tapa y~u tren X, Y ( [22 ],theoreme III.9, p.39), guy B' = f(f-1(B')) cling compact...