XXIII.—Note on a Theorem in Geometry of Position
XXIII.—Note on a Theorem in Geometry of Position
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XXIII.——关于位置几何定理的注释
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Tait
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作者：
Tait
关于地图着色的问题，我顺便给了（Proc. K.S.E. 1880年，第502页）的一个定理，可以说如下：-如果2n点加入3 n线，使三条线，只有三个，满足在每一点，这些线可以他分为（通常在许多不同的方式）成三组的n，使每组之一结束在每一个点。
In connection with the problem of Map-colouring, I incidentally gave (Proc. K.S.E. 1880, p. 502) a theorem which may be stated as follows : — If 2n points be joined by 3n lines, so that three lines, and three only, meet at each point, these lines can he divided (usually in many different ways) into three groups of n each, such that one of each group ends at each of the points.