Question: 3. Let u be a harmonic function. For what functions f is the function f(u) also harmonic? Ans: Au + B 4. Are |f(z)|

3. Let u be a harmonic function. For what functions f is

3. Let u be a harmonic function. For what functions f is the function f(u) also harmonic? Ans: Au + B 4. Are |f(z)| harmonic functions if f(z) is an analytic function? Ans: No

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