... > ta cú vi mi X ớ: Y, o11 (x) |2 < A2,A2 ^2 (l6* w |2 + lc M|s) + _1 Mớ*)! ^ "2- (2. 3) nh ngha 2. 1 Gi s = 1, 72 l khtớch a phng trờn Hm u (a;) e H (ớ) c gi l nghim suy rng ca phng trỡnh khụng thun ... lý 2. 2 [3] Gi s toỏn t L tha mn iu kin (2. 2), (2. 3) v (2. 9) Khi ú vi mi ip H l {ỡ) v g,f l L (ớ), = , bi toỏn Dirichlet (2. 7) Lu = g + Dp l,u = ...