Question: Prove that the Laplacian operator defines a linear function on the vector space of twice continuously differentiable functions f(x, y). af, lf]%3 af ? 2

Prove that the Laplacian operator
a²f, Дlf]%3 a²f ду? Әх2

defines a linear function on the vector space of twice continuously differentiable functions f(x, y).

af, lf]%3 af ? 2

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