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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, 4 months ago

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