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单词 four-colouring
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four-colouring
four-colouring n.
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the world > matter > colour > variegation > [noun] > four colours
four-colouring1963
four-coloration1967
1963 G. A. Dirac in Proc. London Math. Soc. 13 195 Theorem 2 establishes the truth of the four-colour conjecture for a new class of planar graphs..and..furnishes a procedure for verifying that a given suitable planar graph is 4-colourable without having to find a 4-colouring for the whole of it.
1967 O. Ore Four-color Probl. viii. 107 To define a four coloring of the faces in G.
extracted from fouradj.n.
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