... x \\ = \ \TX(X] - x 2)\ \ ỡ ^ c x - x \\; ú, 11JC| - X2 11 = vỡ c > 0, v X X2 - Vỡ X\ ,X2 l tựy ý, ta cú toỏn t Tx : H > T (H) l song ỏnh (ò) Ta nhn thy rng Xo -L T (H) => Xo 0, T (H) ... Theo nh ngha, TX G \ (H) Vỡ gii hn l nht, nờn TX = y, y G T (H) Do ú, Tx(H) l úng vỡ y G T^(H) l tựy ý Do ú, T ( H) H bi (j8 ) Ngha l, R T c xỏc nh trờn ton H, v b chn, nú c trc tip suy t (2) ... Sj, cú ngha l L I I V I I = E ( s j x -s Jx ) = L (s2j x x ) = { S ỡ X, x ) 7=1 7=1 7=1 Vỡ n l tựy ý, chui vụ hn 11S \ X 112 + 11S X 112H -hi t Do ú, 11s nx 11 ằ v s nx > Theo (5), (6 ) v...