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arxiv: 1201.4912 · v1 · pith:UJB3J6WMnew · submitted 2012-01-24 · 🧮 math.CO

Extremal Graphs Without 4-Cycles

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keywords boundevengraphupperachievedc4-freecontaincycles
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We prove an upper bound for the number of edges a C4-free graph on q^2 + q vertices can contain for q even. This upper bound is achieved whenever there is an orthogonal polarity graph of a plane of even order q.

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