f******k
发帖数: 297 | | w***t
发帖数: 96 | 2 may be losted. anyway, too easy. Suppose there is such a solution.
For any point A, constuct unit equilateral triangle ABC and thereby BCA'.
A and A'are of the same color. Thus the circile with center A and radius
AA' is of a single color. All the chord of unit length on the circle is
of one color. Contradiction. So, htat is not possible.
【在 f******k 的大作中提到】
: 再发一遍...
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