Researchers investigate the veracity of ‘six degrees of separation’
The game theoretical framework. The structure of a social network evolves following simple rules of a game. (a) At each step of the game, the individuals forming part of the network (like the red woman in the picture) have to decide whether to stay with the neighborhood formed by their actual friends or to change to another neighborhood formed by potential new friends. The current and new neighborhoods may overlap (in our picture, the blue man and the…