# Definition:Directed Line

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## Definition

A **directed line** is a line along which one direction is specified as being positive, while the opposite direction is specified as being negative.

## Also see

- Results about
**directed lines**can be found**here**.

## Sources

- 1998: David Nelson:
*The Penguin Dictionary of Mathematics*(2nd ed.) ... (previous) ... (next):**directed line** - 2008: David Nelson:
*The Penguin Dictionary of Mathematics*(4th ed.) ... (previous) ... (next):**directed line**