Literatur
A theorem on graphs, Annals of Math., vol.32 (1931), pp. 378–390. We refer to this paper as G. In connection with the map problem, see a coming number of the Mémorial des Sciences Mathématiques, by G. D. Birkhoff.
See G., p. 390; J. H. M. Wedderburn, Annals of Math., vol.24 (1923), p. 121).
See for instance Whitney, the coloring of graphs. Annals of Math., vol.33 (1932), p. 691.
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Mit 2 Textfiguren.
Presented to the American Mathematical Society, Dec. 26, 1933.
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Whitney, H. A numerical equivalent of the four color map Problem. Monatsh. f. Mathematik und Physik 45, 207–213 (1936). https://doi.org/10.1007/BF01707988
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DOI: https://doi.org/10.1007/BF01707988