What is the general form of an analytic function with ux = 0 on a given domain?

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The discussion centers on identifying the general form of an analytic function f(z) = u(x,y) + i*v(x,y) where the partial derivative ux = 0 on a specified domain D. It is established that functions of the form f(z) = y - ix satisfy this condition, indicating that the real part u(x,y) is constant with respect to x. The conversation suggests that there are multiple valid forms of f(z) that meet the criteria, emphasizing the need for further exploration of these functions.

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handiman
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In the question below I do not understand what is meant by the "general form".

'Suppose f(z) = u(x,y) + i*v(x,y) is analytic on a domain D, and ux = 0 on D.
Find the general form of f(z).
 
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maybe they mean find all possible such f. e.g y -ix seems to work, but there many others.
 
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