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In [[information theory]], the '''graph entropy''' is a measure of the information rate achievable by communicating symbols over a channel in which certain pairs of values may be confused.<ref name="DehmerMowshowitz2013">{{cite book|author1=Matthias Dehmer|author2=Abbe Mowshowitz|author3=Frank Emmert-Streib|title=Advances in Network Complexity|url=https://books.google.com/books?id=fHxARaCPTKwC&pg=PT186|date=21 June 2013|publisher=John Wiley & Sons|isbn=978-3-527-67048-2|pages=186–}}</ref> This measure, first introduced by Körner in the 1970s,<ref>{{cite journal|last=Körner|first=János|date=1973|title=Coding of an information source having ambiguous alphabet and the entropy of graphs.|journal=6th Prague conference on information theory|pages= 411–425}}</ref><ref name="LoboKasparis2008">{{cite book|author1=Niels da Vitoria Lobo|author2=Takis Kasparis|author3=Michael Georgiopoulos|title=Structural, Syntactic, and Statistical Pattern Recognition: Joint IAPR International Workshop, SSPR & SPR 2008, Orlando, USA, December 4-6, 2008. Proceedings|url=https://books.google.com/books?id=DWZc9Ti_vBwC&pg=PA237|date=24 November 2008|publisher=Springer Science & Business Media|isbn=978-3-540-89688-3|pages=237–}}</ref> has since also proven itself useful in other settings, including combinatorics.<ref name="BouchonSaitta1988">{{cite book|author1=Bernadette Bouchon|author1-link= Bernadette Bouchon-Meunier |author2=Lorenza Saitta|author2-link= Lorenza Saitta |author3=Ronald R. Yager|title=Uncertainty and Intelligent Systems: 2nd International Conference on Information Processing and Management of Uncertainty in Knowledge Based Systems IPMU '88. Urbino, Italy, July 4-7, 1988. Proceedings|url=https://books.google.com/books?id=V5-6G433s_wC&pg=PA112|date=8 June 1988|publisher=Springer Science & Business Media|isbn=978-3-540-19402-6|pages=112–}}</ref>
==Definition==
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