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What's That?

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The drawing is a simplified rendition of a scale-free network, which Wikipedia defines this way:

In scale-free networks, some nodes act as "highly connected hubs" (high degree), although most nodes are of low degree. Scale-free networks' structure and dynamics are independent of the system's size N, the number of nodes the system has. In other words, a network that is scale-free will have the same properties no matter what the number of its nodes is.

Read the full article from Wikipedia