Definition:Line/Infinite Half-Line
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This page is about ray in the context of geometry. For other uses, see ray.
Definition
An infinite half-line is a line which terminates at an endpoint at one end, but has no such endpoint at the other.
Start Point
The endpoint of an infinite half-line is a known as its start point.
Also known as
Another term for an infinite half-line is a ray.
Some sources merely refer to it as a half-line, its infinitude being taken for granted.
Some sources do not hyphenate, and use the term half line.
Also see
- Results about infinite half-lines can be found here.
Sources
- 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): half-line
- 1989: Ephraim J. Borowski and Jonathan M. Borwein: Dictionary of Mathematics ... (previous) ... (next): ray: 1.
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): half line (ray)
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): half-line (ray)
- 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): half-line