§8.1定义、收敛域 3序列的分类与收敛域 (1)右边序列:x(n),n∈{n,∞ X(=)=∑x(m) n-ni p=lim/ x(n)=/(n)=< >limy(n)R,圆的外部1mz <0.R Rez n1≥0,R1<2≤∞ 88 §8.1 定义、收敛域 • 3.序列的分类与收敛域 – (1)右边序列： x n n n ( ), ,    1  ( ) ( ) ( ) ( ) ( ) 1 1 1 lim lim 1 lim , n n n n n n n n n x n X z x n z x n z x n z z x n R   − = − − → → →  = =     圆的外部 ReZ jImZ o Rx1 1 1 1 1 0, 0, x x n R z n R z        