Question: 3. (15 points) Let D be a bounded and smooth domain in R3. Let f : D > R and g : 8.0 > R

3. (15 points) Let D be a bounded and smooth domain in R3. Let f : D > R and g : 8.0 > R be two smooth and bounded functions. Prove the uniqueness of solution to the boundary value problem Au + u = f in D and any. = g on 8D, where 8\" denotes the normal derivative along the boundary 8D

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