导数:定义 设=∫(x)是区域G内的单值函数,如果在G内 的某点z lim f(z+4z)-f( △ 存在,则称函数∫(z)在z点可导 极限值,记为f(2),即称为f(2)在点的导Analytic Functions Elementary Functions Differentiability Analyticity 굽 w = f(z)´«GSüŠ¼ê§XJ3GS ,:z lim ∆z→0 ∆w ∆z = lim ∆z→0 f(z + ∆z) − f(z) ∆z 3§K¡¼êf(z)3z:Œ d4Š§Pf 0 (z)§=¡f(z)3z:ê C. S. Wu 1ù )Û¼ê