Geodesic
An Elementary Proof of Gram's Theorem for Convex Polytopes
Canadian journal of mathematics, Tome 19 (1967) no. 1, pp. 1214-1217

Voir la notice de l'article provenant de la source Cambridge University Press

Let P be a d-polytope (that is, a d-dimensional convex polytope in Euclidean space) and for 0 ≤ j ≤ d – 1 let (i = 1, . . . ,ƒj(P)) represent its j-faces. Associated with each face is a non-negative number φ(P, ), to be defined later, which is called the interior angle of P at the face . 
Shephard, G. C. An Elementary Proof of Gram's Theorem for Convex Polytopes. Canadian journal of mathematics, Tome 19 (1967) no. 1, pp. 1214-1217. doi: 10.4153/CJM-1967-110-7
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