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Leibnitz's Rule for Differentiating Integrals
This is Leibnitz's rule for differentiation of integrals. I wasn't
sure where else to stick it.

(2.6) 
We generalize this to 3 dimensions with being the time,

(2.7) 
where is the volume with surface area and
is the velocity of the boundary. This is particularly
useful for conservation laws.
Ben Breech
20030114