History
Extremal graph theory, in its strictest sense, is a branch of graph theory developed and loved by Hungarians.
Bollobás (2004)Extremal graph theory started in 1941 when Turán proved his theorem determining those graphs of order n, not containing the complete graph Kk of order k, and extremal with respect to size (that is, with as many edges as possible). Another crucial year for the subject was 1975 when Szemerédi proved his result a vital tool in attacking extremal problems.
Read more about this topic: Extremal Graph Theory
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