因为V[n]收敛,所以存在正整数N1,当n>N1时,|V[n]|N2时,任意正整数p,|U[n]|+|U[n+1]|+...+|U[n+p]|N时,任意正整数p,|U[n]V[n]|+|U[n+1]V[n+1]|+...+|U[n+p]V[n+p]|
