9 D ec 2 00 5 Cooperation and defection in ghetto

O ct 2 00 7 Ghetto of Venice : Access to the Target Node and the Random Target Access Time

Random walks defined on undirected graphs assign the absolute scores to all nodes based on the quality of path they provide for random walkers. In city space syntax, the notion of segregation acquires a statistical interpretation with respect to random walks. We analyze the spatial network of Venetian canals and detect its most segregated part which can be identified with canals adjacent to the...

s . so c - ph ] 6 J un 2 00 6 Prisoner ’ s Dilemma cellular automata revisited : evolution of cooperation under environmental pressure

We propose an extension of the evolutionary Prisoner's Dilemma cellular automata, introduced by Nowak and May [14], in which the pressure of the environment is taken into account. This is implemented by requiring that individuals need to collect a minimum score U min , representing indispensable resources (nutrients, energy, money, etc.) to prosper in this environment. So the agents, instead of...

Reasons for cooperation and defection in real-world social dilemmas

Interventions to increase cooperation in social dilemmas depend on understanding decision makers’ motivations for cooperation or defection. We examined these in five real-world social dilemmas: situations where private interests are at odds with collective ones. An online survey (N = 929) asked respondents whether or not they cooperated in each social dilemma and then elicited both open-ended r...

ar X iv : h ep - p h / 00 12 24 8 1 9 D ec 2 00 0 1 The Naked Truth about Hadronic Regge Trajectories A . E .

2 9 D ec 2 00 8 On potentially K 6 − C 5 graphic sequences ∗

For given a graph H , a graphic sequence π = (d1, d2, · · · , dn) is said to be potentially H-graphic if there exists a realization of π containing H as a subgraph. In this paper, we characterize the potentially K6 − C5 -graphic sequences .