On a four-colour theorem. (Q4116456)

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scientific article; zbMATH DE number 3540820
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English
On a four-colour theorem.
scientific article; zbMATH DE number 3540820

    Statements

    title
    On a four-colour theorem. (English)
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    author
    Helge Tverberg
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    publication date
    1977
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    Identifiers

    zbMATH DE Number
    3540820
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    OpenAlex ID
    W2530833688
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