Definition:Cylindrical Surface/Directrix
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Definition
The directrix of a cylindrical surface $S$ is the curve $C$ through which pass all the parallel straight lines forming $S$.
Also see
- Results about cylindrical surfaces can be found here.
Sources
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): cylindrical surface
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): cylindrical surface