Geodesic
Schemes and the iP-graph
Journal of Algebraic Combinatorics, Tome 28 (2008) no. 2, pp. 271-279.

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

Summary: We consider the common-divisor graph of the set of valencies of a naturally valenced scheme, where scheme is defined in the sense of P.-H. Zieschang. We prove structural results about this graph, and thus give restrictions on the set of natural numbers that can occur as the set of valencies of a naturally valenced scheme.
Keywords: keywords naturally valenced schemes, IP graph, kernel, common-divisor graph 
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     author = {Camina, Rachel},
     title = {Schemes and the {iP-graph}},
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     url = {http://geodesic.mathdoc.fr/item/JAC_2008__28_2_a2/}
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Camina, Rachel. Schemes and the iP-graph. Journal of Algebraic Combinatorics, Tome 28 (2008) no. 2, pp. 271-279. http://geodesic.mathdoc.fr/item/JAC_2008__28_2_a2/