what is the physical significance of divergence of a vector field
Divergence In physical terms, the divergence of a three-dimensional vector field is the extent to which the vector field flow behaves like a source at a given point. It is a local measure of its "outgoingness" â€“ the extent to which there is more of some quantity exiting an infinitesimal region of space than entering it. If the divergence is nonzero at some point then there must be a source or sink at that position.[1] (Note that we are imagining the vector field to be like the velocity vector field of a fluid (in motion) when we use the terms flow, source and so on.)
Limit of a function (the Dirichlet function) has no limit at any x-coordinate.
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Vein Veins are less muscular than arteries and are often closer to the skin. There are valves in most veins to prevent backflow.