... andXn=AonTInhY=Bo?Trong doXl,X2 , , Xn , YlacacbienmotrencacviitruU , U2 , , Un,VvaAij , Bi , l'= 0, , k,j= 1, , nlacac t~p mo&apos ;, '• Neun=1 vak= 1, bai toan tren ... [ 0, I] cu aAOIt6iAil,i= 1, , kdiro'c dinh nghia(A A ) - OL(AOl' All, A2l, , Akl;a) -dL(AOl' Ail;a)st.0 1, tl,a - (OL AOl,All,A2 1, ,Akl;a)(A A.)- OU(AOl,All,A2 1, ,Akl;a)-du(Aol,Ail;a)su0 1, ... OU(AOl,All,A2 1, ,Akl;a)-du(Aol,Ail;a)su0 1, il,a - (Ou AOl,All,A2 1, ,Akl;a)(5)(6)trong d6Aila , i=O,l, ,kIil.lcit d.t a cuaAOl,All, ,Akl,inf, sup turrng rmg v6i. Infremum,Supremum.Tro'...