In mathematics, two pairs of points in a cyclic order such as the real projective line separate each other when they occur alternately in the order. Thus the ordering a b c d of four points has (a,c) and (b,d) as separating pairs.
In mathematics, two pairs of points in a cyclic order such as the real projective line separate each other when they occur alternately in the order. Thus the ordering a b c d of four points has (a,c) and (b,d) as separating pairs.
Source: Wikipedia "Point-pair separation" · CC BY-SA 4.0
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