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Two disjoint simple closed curves on a sphere bound an annulus . If both are geodesics, its boundary geodesic-curvature terms vanish, whereas . Gauss-Bonnet would give
which is impossible when everywhere.

Ancestors (6)

  1. Gauss-Bonnet theorem
  2. Differential geometry
  3. Geometry and topology
  4. Area of mathematics
  5. Mathematics
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