%0 Journal Article %T Strongly barycentrically associative and preassociative functions %A Jean-Luc Marichal %A Bruno Teheux %J Mathematics %D 2014 %I arXiv %X We study the property of strong barycentric associativity, a stronger version of barycentric associativity for functions with indefinite arities. We introduce and discuss the more general property of strong barycentric preassociativity, a generalization of strong barycentric associativity which does not involve any composition of functions. We also provide a generalization of Kolmogoroff-Nagumo's characterization of the quasi-arithmetic mean functions to strongly barycentrically preassociative functions. %U http://arxiv.org/abs/1411.5897v1