A numerical equivalent of the four color map problem.
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Publication:2601265
DOI10.1007/BF01707988zbMath63.0551.01OpenAlexW1985022227MaRDI QIDQ2601265
No author found.
Publication date: 1937
Published in: Monatshefte für Mathematik und Physik (Search for Journal in Brave)
Full work available at URL: https://doi.org/10.1007/bf01707988
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