...列（right-sided sequence） 左边序列（left-sided sequence） 双边序列（two-sided sequence） Z 逆变换（inverse Z transform） 围线积分法（contour integral method） 幂级数展开法（power series expansion） z 域微分（differentiation in the z-domain）...
Because inverseZtransformin the case of 2D is much more complicatedthan that in 1 D, which appears in 2 D convergentregion or twovariates factorization or teriable computations, etc.