In the context of network theory, a complex network is a graph (network)
with non-trivial topological features—features that do not occur in simple
networks such as lattices or random graphs but often occur in networks
representing real systems. The study of complex networks is a young and active
area of scientific research (since 2000) inspired largely by empirical
findings of real-world networks such as computer networks, biological
networks, technological networks, brain networks, climate networks and social
networks.
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