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Code:

[tex]\int\nabla\cdot\left[\left(\Delta{D}\right){V}\right]{d}\tau[/tex]

where D is the dielectric displacement

Now that turns into (by divergence theorem):

[tex]\int\left(\nabla{D}{V}\right)\cdot{d}a[/tex]

Now my textbook says that this term would vanish if we integrate over all of space. Why is that? Thanks for your help in advance. =)