Abstract
THE correctness of the statement that any plane map may always be tinted with four colours in such a way that two areas meeting on the same boundary never have the same colour has always been admitted since Möbius mentioned it in 1840, although no mathematical proof of this theorem has yet been firmly established. I think I have found a rigorous and general proof of it. First, I have a theoretical proof of the common enunciation; secondly, I suggest a practical method of colouring. The complete paper is being submitted for publication elsewhere.
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DE BACKER, S. The Four-Colour Problem. Nature 153, 710 (1944). https://doi.org/10.1038/153710a0
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DOI: https://doi.org/10.1038/153710a0
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