Showing that f'(z) does not exist at any point (complex analysis)

I am having a hard time showing that f'(z) does not exist at any point for

f(z)=z-z(conjugate)

An explanation would be greatly appreciated,

Thanks.

Quote:

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Originally Posted by nankor

I am having a hard time showing that f'(z) does not exist at any point for

f(z)=z-z(conjugate)

An explanation would be greatly appreciated,

Thanks.

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do you mean



so





So does not satisfy the cauchy-reimann equation at any point so it is not diff at any point