Biggs conjectured that the resistance between any two points on a distance-regular graph of valency greater than 2 is bounded by twice the resistance between adjacent points. We prove this conjecture, give the sharp constant for the inequality, and display the graphs for which the conjecture most nearly fails. Some necessary background material is included, as well as some consequences.
机构:
HUN REN Alfred Reny Inst Math, Realtanoda Utca 13-15, H-1053 Budapest, HungaryHUN REN Alfred Reny Inst Math, Realtanoda Utca 13-15, H-1053 Budapest, Hungary
Pyber, Laszlo
Skresanov, Saveliy V.
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机构:
Sobolev Inst Math, 4 Acad Koptyug Ave, Novosibirsk 630090, RussiaHUN REN Alfred Reny Inst Math, Realtanoda Utca 13-15, H-1053 Budapest, Hungary