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Jul 7, 2010 at 3:37 comment added Marcos Cossarini A 2-form in a 3-manifold does not retain the information of the orientation of the tangent plane to the surface. It rather provides a mass density (or charge density, to account for the sign) for each surface.
Jun 4, 2010 at 18:56 vote accept Mircea
Jun 4, 2010 at 18:56
Jun 3, 2010 at 18:09 history answered coudy CC BY-SA 2.5