Can someone please explain the meaning of flux 2-integral in this sentence:

Mass is evaluated as a flux 2-integral at the asymptotic infinity.

For asymptotic infinity, I believe it is as explained in this Math.SE post.

  • $\begingroup$ We will need a lot more context to answer this question, as far as I can tell a 2-integral may mean a double integral. This would fit with a flux integral being the double integral over the scalar product of a vector and an area element. But what it has to do with mass depends on the context...it has meaning in fluid dynamics where they might mean mass transfer rate through a cross sectional area. $\endgroup$ – Triatticus Nov 17 '18 at 17:19
  • $\begingroup$ Quote from which reference? $\endgroup$ – Qmechanic Nov 17 '18 at 18:34

A 2-integral means an integral over a two-dimensional hypersurface.

Flux means the “flow” of some quantity across this surface. Mathematically, you are usually integrating the components of some tensor perpendicular to the hypersurface.


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