333 discrete divergence theorem why is the flow across the cut in the
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3.3.3 Discrete divergence theorem: Why is the flow across the “cut" in the figure equal to the sum of the flows from the individual nodes A,B,C,D? Note: This is true
even if flows liked, d1- d6 from nodes like A are nonzero. If the current law holds and each node has zero net flow,then the exercise says that the flow across every cut is zero.