Nonlinear Sciences – Adaptation and Self-Organizing Systems
Scientific paper
2010-10-09
Nonlinear Sciences
Adaptation and Self-Organizing Systems
12 pages, 2 figures
Scientific paper
It is not uncommon for certain social networks to divide into two opposing camps in response to stress. This happens, for example, in networks of political parties during winner-takes-all elections, in networks of companies competing to establish technical standards, and in networks of nations faced with mounting threats of war. A simple model for these two-sided separations is the dynamical system dX/dt = X^2 where X is a matrix of the friendliness or unfriendliness between pairs of nodes in the network. Previous simulations suggested that only two types of behavior were possible for this system: either all relationships become friendly, or two hostile factions emerge. Here we prove that for generic initial conditions, these are indeed the only possible outcomes. Our analysis yields a closed-form expression for faction membership as a function of the initial conditions, and implies that the initial amount of friendliness in large social networks (started from random initial conditions) determines whether they will end up in intractable conflict or global harmony.
Kleinberg Jon M.
Kleinberg Robert D.
Marvel Seth A.
Strogatz Steven H.
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