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Нарисован слева набор точек на плоскости, среди которых много пар точек на расстроянии 1. И справа вторая картинка с примерами.

Человечеству до сих пор неизвестно, сколько цветов нужно, чтобы покрасить точки плоскости так, чтобы не было точек одного цвета на расстоянии 1 (а вышеупомянутые графы помогают решать эту проблему).

Недавно (2018) биолог(!) доказал, что нужно не менее 5 цветов (популярное изложение).



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Нарисован слева набор точек на плоскости, среди которых много пар точек на расстроянии 1. И справа вторая картинка с примерами.

Человечеству до сих пор неизвестно, сколько цветов нужно, чтобы покрасить точки плоскости так, чтобы не было точек одного цвета на расстоянии 1 (а вышеупомянутые графы помогают решать эту проблему).

Недавно (2018) биолог(!) доказал, что нужно не менее 5 цветов (популярное изложение).

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