推 air11 :1.用微分的定義；2.C-R condition+二維的chain rule 10/25 18:27
1. { 0 , z = 0
{
f(z)= { x(y^2)(x+iy)
{ ─────── , z =\= 0
{ x^2+y^4
Show f does not have a derivative at z = 0
2.Cauchy-Riemann conditions in polar coordinates
w = f(z) = u(x,y)+iv(x,y)
Suppose that U and V are expressed in polar coordinates
(r,θ) , and U_r,U_θ,V_r,V_θ are continuous (z =/= 0)
Show U_r = (1/r)V_θ , V_r = (-1/r)U_θ
拜託了 謝謝
最近在上複變，但是覺得讀起來好卡
是不是要重讀高微和基微阿，感覺我的基礎很差
請問各位有沒有特別要重看的章節阿 謝謝
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