Half-line (ray)

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One of the parts of a line into which that line is divided by any point $O$ on it. If the point $O$ is attached to the half-line, then that half-line is called a closed half-line (or closed ray).

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Half-line (ray). Encyclopedia of Mathematics. URL:
This article was adapted from an original article by BSE-3 (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article