The discrete metric on the X is given by : d(x, y) = 0 if x = y and d(x, y) = 1 otherwise. Then this does define a metric, in which no distinct pair of points are "close". The fact that every pair is "spread out" is why this metric is called discrete.
In either the English or the metric system, we can measure volume is by relating it to a standard used to measure length. In this experiment, we are going to measure the volume of a small box using one of the English units of length, the inch. , Basic unit of mass in the metric system and abbreviation, The metric unit of length and abbreviation, Basic unit for volume, Metric prefix means "1,000" times smaller than the unit it comes before