Geodesic
Fractional multiples of graphs and the density of vertex-transitive graphs
Journal of Algebraic Combinatorics, Tome 10 (1999) no. 1, pp. 61-68.

Voir la notice de l'article provenant de la source Electronic Library of Mathematics

Summary: We introduce a construction called the fractional multiple of a graph. This construction is used to settle a question raised by E. Welzl: We show that if G and H are vertex-transitive graphs such that there exists a homomorphism from G to H but no homomorphism from H to G, then there exists a vertex-transitive graph that is homomorphically $ldquo$in between $rdquo$ G and H.
Keywords: fractional chromatic number, graph, homomorphism 
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     title = {Fractional multiples of graphs and the density of vertex-transitive graphs},
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Tardif, Claude. Fractional multiples of graphs and the density of vertex-transitive graphs. Journal of Algebraic Combinatorics, Tome 10 (1999) no. 1, pp. 61-68. http://geodesic.mathdoc.fr/item/JAC_1999__10_1_a1/