Geodesic
On Cauchy's Lemma Concerning Convex Polygons
Canadian journal of mathematics, Tome 19 (1967) no. 1, pp. 1062-1071

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

One of the authors having just presented Cauchy's theorem on convex polyhedra to a class on “Convexity” at the University of Wisconsin, a discussion on Cauchy's lemma on convex polygons led to an exchange of letters which are here reproduced. The three letters are independently readable. Two new proofs of Cauchy's lemma are given, of which the second (§3) is very short. 
Schoenberg, I. J.; Zaremba, S. K. On Cauchy's Lemma Concerning Convex Polygons. Canadian journal of mathematics, Tome 19 (1967) no. 1, pp. 1062-1071. doi: 10.4153/CJM-1967-096-4
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[1] 1. Alexandrow, A. D., Konvexe Polyeder (German translation from Russian; Akademie-Verlag, Berlin, 1958). Google Scholar

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