Asked by Anonymous

Determine whether the function f(x,y)=ln(x^2 +y^2) is harmonic.
Answered by oobleck
well, does ∇²f = 0?
Fxx = 2(y^2-x^2)/(x^2+y^2)^2
Fyy = 2(x^2-y^2)/(x^2+y^2)^2
so, what do you think?
Answered by Anonymous
No, but how do you know they equal zero or not?
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