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Half Line |
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half line [′haf ¦līn]
(astronomy) Half Line in mathematics, the set of points on a line that lie on one side of some point of the line. The coordinates x of the points of a half line satisfy one, and only one, of the inequalities x > a and x < a, where a is a constant. The point x = a is called the boundary of the half line. If the boundary is included in the half line, the half line is said to be closed. A closed half line is also called a ray. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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