Use the Product Rule to show that a af fm + fr = r 0 (1) r
Question:
Use the Product Rule to show that
a af fm + fr = r 0 (1) r r
Use this formula to show that if f is a radial harmonic function, then rƒr = C for some constant C. Conclude that ƒ(x, y) = C ln r + b for some constant b.
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a af fm + fr = r 0 (1) r r
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