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Erdős problem 23

The blow-up of C5C_5 shows that the bound n2n^2 in Erdős Problem 23 is tight: any bipartite subgraph must omit at least n2n^2 edges.
Retained from Formal Conjectures · not edited here
Formal statements
1 open · 2 solved · 3 test
Erdős Problems says
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Accepted in Vela Mathematics Program

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