it is a closed ray; otherwise it is an open ray.

Extensions of the concept

Logarithmic scale

thumbOn the number line, the distance between two points is the unit length if and only if the difference of the represented numbers equals 1. Other choices are possible.

One of the most common choices is the logarithmic scale, which is a representation of the positive numbers on a line, such that the distance of two points is the unit length, if the ratio of the

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