f If M is a point set and P is a point, then by I (PM) is meant the lower bound of the distances from P to all the different points of M. If M and N are two point sets, then by l(MN) is meant the lower bound of the values [l(PN)} for all points P of M, while by u(MN) is meant the upper bound of these values for all points P of M. It is to be observed that u{MN) may be different from u(NM).
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