伸缩率不变性 设w=f(z)在区域D内解析,∈D,且∫(z)≠0 因为r(n)=Im()-/(n)=imA形 △∽0△z 令Δ2=△zl0,△w=△ne ↑y(z) w=f(z)ty(w) △z △ 00 0 0 ( ) ( ) ( ) lim 0 z z f z f z f z z z − −  = → 因为 , i 令 z = z e C  y 0 x (w) w w0 w . . y w = f (z) 0 x (z) z 0 z z . lim , 0 z w z   =  → . i w = w e 设w = f (z)在区域D内解析, , ( ) 0. z0  D 且 f  z0  2．伸缩率不变性