CollapseProblem 60Does every graph on nnn vertices with >ex(n;C4)>\mathrm{ex}(n;C_4)>ex(n;C4) edges contain ≫n1/2\gg n^{1/2}≫n1/2 many copies of C4C_4C4?Source: erdosproblems.com/60Graph theoryCyclesWiki pageStatusOpenNo claim settles this problem.ReferencesHeMaYa21He, J. and Ma, J. and Yang, T., Some extremal results on 4-cycles. J. Combin. Theory Ser. B 149 (2021), 92-108.