... XO)= s(t, x"), tEl n (a', /3') Tinh ton t~i nhat dU'Ongcong qua m6i di~m cho phep ta hqp hai dU'Ongcong x(t, XO)va ~" s(t, x") m(>tdU'Ongcong lOp coo: x(t, XO),t E (a', /3') U I = (a', /3"), /3" ... minh x(t, XO)con co th~ duqc xac dinh tren mien IOnhemkhoang toi d~i 34 Do dU'Ongcong x(t, xO) nam ho~mto~mtrong BEcompact, lien ton t~i di~m giOi h~n x' E BE \ {a} cua x(t, xO): lim x(t, XO)= ... mQi duOng cong x(t, XO),XO E Be\ {a}, co th~ duqc mb rQng mien xac dinh tren (0, (;2].Gia siXtruOng vec-t0 w(x) duqc dvng tren t~p mb IOn hem Be\ {a} va chua cac di~m bien cua Be DuOngcong xU,...