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Chapter 13 Stokes’ theorem - Rice University
www.owlnet.rice.eduit is orthogonal to the tangent space TpM. There are of course two choices of such a normal vector, and we now need to make a choice. DEFINITION. The surface M is said to be orientable if there exists a unit normal vector Nb(p) at each point p 2 M which is a continuous function of p. The continuity of Nb(p) is all-important. For instance, one ...