Editing Complex system (section)

===Complexity and network science===
A complex system is usually composed of many components and their interactions. Such a system can be represented by a network where nodes represent the components and links represent their interactions.<ref name="DorogovtsevMendes2003">{{Cite book |last1=Dorogovtsev |first1=S.N. |title=Evolution of Networks |last2=Mendes |first2=J.F.F. |year=2003 |isbn=9780198515906 |volume=51 |pages=1079 |doi=10.1093/acprof:oso/9780198515906.001.0001 |arxiv=cond-mat/0106144}}</ref><ref name="Newman2010">{{Cite book |last=Newman |first=Mark |url=https://cds.cern.ch/record/1281254 |title=Networks |year=2010 |isbn=9780199206650 |doi=10.1093/acprof:oso/9780199206650.001.0001}}{{Dead link|date=July 2020 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> For example, the [[Internet]] can be represented as a network composed of nodes (computers) and links (direct connections between computers). Other examples of complex networks include social networks, financial institution interdependencies,<ref>{{Cite journal |last1=Battiston |first1=Stefano |last2=Caldarelli |first2=Guido |last3=May |first3=Robert M. |last4=Roukny |first4=tarik |last5=Stiglitz |first5=Joseph E. |date=2016-09-06 |title=The price of complexity in financial networks |journal=Proceedings of the National Academy of Sciences |language=en |volume=113 |issue=36 |pages=10031–10036 |bibcode=2016PNAS..11310031B |doi=10.1073/pnas.1521573113 |pmc=5018742 |pmid=27555583 |doi-access=free}}</ref> airline networks,<ref name="BarratBarthelemy2004">{{Cite journal |last1=Barrat |first1=A. |last2=Barthelemy |first2=M. |last3=Pastor-Satorras |first3=R. |last4=Vespignani |first4=A. |year=2004 |title=The architecture of complex weighted networks |journal=Proceedings of the National Academy of Sciences |volume=101 |issue=11 |pages=3747–3752 |arxiv=cond-mat/0311416 |bibcode=2004PNAS..101.3747B |doi=10.1073/pnas.0400087101 |issn=0027-8424 |pmc=374315 |pmid=15007165 |doi-access=free}}</ref> and biological networks.