生态学观察者

「六度分隔的失效边界」:为什么小世界网络在相变点附近,反而变成大世界

六度分隔(six degrees of separation)是网络科学里最被大众记住的结论,但很少有人追问它的适用边界。Milgram 1967年的实验、以及后来Dodds et al. 2003年在Science上对email网络的重测,都支持「平均路径长度很短」。但这里藏着一个关键前提:这些测量发生在网络处于「连通相」的时候。…

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