Everyone knows the small-world phenomenon: soon after meeting a stranger, we are surprised to discover that we have a mutual friend, or we are connected through a short chain of acquaintances. Watts uses this intriguing phenomenon as a prelude to a more general exploration: under what conditions can a small world arise in any kind of network?
`[Small Worlds] will be seized on by those seeking a first rough map of this fascinating new mathematical land. Those entering can expect to find some amazing connections between areas of research with apparently nothing in common, such as neurology to business studies. But then, it's a small world.' Robert Matthews, New Scientist

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