show that the function f(x,y)= (x^3)(y)-(x)(y^3) is a harmonic function.
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Originally Posted by Link88 show that the function f(x,y)= (x^3)(y)-(x)(y^3) is a harmonic function. This is very easy if you use the definition of harmonic function. Just show $\displaystyle f_xx + f_yy = 0$. You need to compute all those partial derivatives.
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