2. Let 2 be an open set in R" with n ≥ 3, and u be a harmonic function in N. Let & € R¹ and A> 0. Define Prove that αξ,λ u૬,A(T) := := 1 |x - ε|n-20 u (ε + № ²(x=0)). - 5/1²). is harmonic in its domain.

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