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 Aw= lim f(2+ 42)-f( △2-0△z △ 存在,则称函数∫(z)在z点可导 此极限值,记为∫(z),即称为f(2)在点的导数Analytic Functions Elementary Functions Differentiability Analyticity 굽 w = f(z)´«GSü¼ê§XJ3GS ,:z lim ∆z→0 ∆w ∆z = lim ∆z→0 f(z + ∆z) − f(z) ∆z 3§K¡¼êf(z)3z: d4§Pf 0 (z)§=¡f(z)3z:ê C. S. Wu 1ù )Û¼ê