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Strong perfect graph theorem
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==Relation to the weak perfect graph theorem== Another conjecture of Berge, proved in 1972 by [[László Lovász]], is that the complement of every perfect graph is also perfect. This became known as the [[perfect graph theorem]], or (to distinguish it from the strong perfect graph conjecture/theorem) the weak perfect graph theorem. Because Berge's forbidden graph characterization is self-complementary, the weak perfect graph theorem follows immediately from the strong perfect graph theorem.
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