Geodesic
Cell Complexes, Valuations, and the Euler Relation
Canadian journal of mathematics, Tome 22 (1970) no. 2, pp. 235-241

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

1. Recently a number of functions have been shown to satisfy relations on polytopes similar to the classic Euler relation. Much of this work has been done by Shephard, and an excellent summary of results of this type may be found in [11]. For such functions, only continuity (with respect to the Hausdorff metric) is required to assure that it is a valuation, and the relationship between these two concepts was explored in [8]. It is our aim in this paper to extend the results obtained there to illustrate the relationship between valuations and the Euler relation on cell complexes.To fix our notions, we will suppose that everything takes place in a given finite-dimensional Euclidean space X.A polytope is the convex hull of a finite set of points and will be referred to as a d-polytope if it has dimension d. Polytopes have faces of all dimensions from 0 to d – 1 and each of these is in turn a polytope. A k-dimensional face will be termed simply a k-face. 
Perles, M. A.; Sallee, G. T. Cell Complexes, Valuations, and the Euler Relation. Canadian journal of mathematics, Tome 22 (1970) no. 2, pp. 235-241. doi: 10.4153/CJM-1970-030-9
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