how to detect a point is within a range

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David Chan (tfchan++at++cs.cuhk.hk)
Mon, 17 Feb 1997 19:00:38 +0800 (HKT)

HI,
        If a point is in a model, how to define a kind of range, so that
all points within the range is belong to the point?
        Now if the range is defined, is it possible to detect a point is
within the range?

                Bye!

                David

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