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Inequality of Ramsey number

Suppose that \( R(p-1,q),R(p,q-1) \) are even number. Why the following inequality is true ??

\( R(p,q)\leq R(p-1,q)+R(p,q-1)-1 \)

Note by Pasharapon Pongpattanakit
3 years, 1 month ago

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