Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §15.4 Surface Integrals, #31 · Multivariable Calculus · Green, Stokes & divergence
Make a “double Möbius strip” from a strip of paper by twisting…
Make a “double Möbius strip” from a strip of paper by twisting it twice and taping the ends. Does a normal vector (use a pen) have the same direction after a round trip?
Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §15.4 Surface Integrals, #31
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