grandes-ecoles 2018 Q4

grandes-ecoles · France · centrale-maths2__mp Differential equations Higher-Order and Special DEs (Proof/Theory)
Give a non-constant function belonging to $\mathcal{H}(U)$. Is the product of two harmonic functions a harmonic function? 
Give a non-constant function belonging to $\mathcal{H}(U)$. Is the product of two harmonic functions a harmonic function?
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