F(2)=∑f(zk 单边 k= f(k)= F(Z)ZK dz k20 g°c z[(k)=F(z) z(Z)]=f(k) f(k)←→F(F(Z)= 单边 f(k)= k≥0 Z[f(k)]=F(Z) [F(Z)]=f(k) f(k) ←→F(Z)  ( )  k=− f k -k Z  − c k F Z Z dZ j 1 ( ) 2 1  −1 Z