Totally odd K-4-subdivisions in 4-chromatic graphs

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    We prove the conjecture made by Bjarne Toft in 1975 that every 4-chromatic graph contains a subdivision of K-4 in which each edge of K-4 corresponds to a path of odd length. As an auxiliary result we characterize completely the subspace of the cycle space generated by all cycles through two fixed edges. Toft's conjecture was proved independently in 1995 by Wenan Zang.
    Original languageEnglish
    Issue number3
    Pages (from-to)217-443
    Publication statusPublished - 2001

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