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Urgent! ! ! Ask the god of mathematics to help me borrow the topic of university complex variable function.
u=x? ,v=y?

u/? x=2x,? u/? y=0

v/? x=0,? v/? y=2y

According to Cauchy Riemann equation:

u/? x=? v/? y→2x=2y→x=y

u/? y=-? v/? X is established

So f(z) is differentiable on the straight line y = x.

But f(z) is not differentiable at any point outside the straight line,

The analysis of f(z) at a certain point requires that it can be differentiated in a neighborhood of that point, so f(z) is not analyzed anywhere in the z plane.