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Use this tag for questions about singularities in physical quantities, i.e. cases where a quantity becomes or appears to become infinite or ill-defined. Consider the more specific tags [black-holes] and [wormholes] for certain kinds of singularities occurring in general relativity. For the procedure of "getting rid" of singularities, consider the [regularization] tag.
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Is divergence infinite when the source is a single point?
EDIT
Can divergence of a vector field be positive everywhere or almost everywhere?
Can it be positive (but finite) at just one point? Is it the case when the point is the source of gas flow, from whic …