Geodesic
Normal Semimodules: A Theory of Generalized Convex Cones
Canadian journal of mathematics, Tome 36 (1984) no. 1, pp. 156-177

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

In [3], C. Davis showed that if a convex polyhedral cone C (the positive span of a finite set of vectors in Euclidean space) contains no nonzero linear subspace, then C is linearly isomorphic to the set V + of nonnegative points in a linear subspace V of R n. Moreover n can be taken to be the number of facets (maximal proper faces) of C. 
Marcus, Daniel A. Normal Semimodules: A Theory of Generalized Convex Cones. Canadian journal of mathematics, Tome 36 (1984) no. 1, pp. 156-177. doi: 10.4153/CJM-1984-011-x
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[1] 1. Bondy, J. A. and Murty, U. S. R., Graph theory with applications (American Elsevier, New York, 1976). Google Scholar | DOI

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