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Variable conversion in surface integral

  1. Sep 26, 2011 #1
    Hello helpful fellas, I'm reading an ecological model that involves setting up boundaries conditions. As part of a longer derivation, there is this flux equation (seen in attachment). Since I haven't formally studied vector calculus, please educate me in how it works and preferably with derivations showing the equality.


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  2. jcsd
  3. Sep 27, 2011 #2


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  4. Oct 12, 2011 #3
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