Yes, the x-distance, y-distance, z-distance, or any combination of the three between any two points may be zero
Not possible.
If the distance between two points is zero then the points are the same.
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An interval. The short distance is the length of a straight line joining the two points.
The distance postulate is such: the shortest distance between two points is a line.(xy, x-y) The distance postulate is such: the shortest distance between two points is a line.(xy, x-y)
That is simply called the "distance".
wavelength
The distance between two points is Square root of [ (difference in their 'x' coordinates)2 + (difference in their 'y' coordinates)2 ]