Wikipedia:Reference desk/Archives/Mathematics/2012 June 14

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June 14

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n in definition of Green's theorem

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In the following identity,  , what does   represent? ? Widener (talk) 20:40, 14 June 2012 (UTC)[reply]

It represents a normal -- this is the directional derivative in the direction perpendicular to the surface. Looie496 (talk) 21:18, 14 June 2012 (UTC)[reply]