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Dual angles in affine space.104 3. Dual angles in Euclidean space.109 4. Convex cells and their tubes.110 5. Curved cells and their tubes.112 6. Gauss-Bonnet formula for imbedded cells.116 7. Gauss-Bonnet formula for Riemannian polyhedra.
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Allendoerfer et al. (1943) studied this question.
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