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Wallis's conical edge : ウィキペディア英語版
Wallis's conical edge

Wallis's conical edge is a ruled surface given by the parametric equations:
: x=v\cos u,\quad y=v\sin u,\quad z=c\sqrt.\,
where ''a'', ''b'' and ''c'' are constants.
Wallis's conical edge is also a kind of right conoid.
Figure 2 shows that the Wallis's conical edge is generated by a moving line.
Wallis's conical edge is named after the English mathematician John Wallis, who was one of the first to use Cartesian methods to study conic sections.()
== See also ==

* Ruled surface
* Right conoid

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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