identity resulting from the divergence theorem applied to the vector field , where f1 and f2 are two scalar fields given at each point of a three-dimensional domain V limited by a closed surface S: where dV is the volume element, endA is the vector surface element and Δ is the Laplacian operator NOTE 1 The second Green formula is sometimes called in English “second Green theorem” or “second Green identity”. NOTE 2 The second Green formula is symmetric with respect to f1 and f2.
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