Definition:Copunctal

Definition

Copunctal means having a common point.

Copunctal Lines

Three (or more) lines are copunctal if and only if there exists a point $P$ that lies on all the lines.

In this context, these lines may be understood as encompassing straight lines and plane curves.

Copunctal Planes

Three (or more) planes are copunctal if and only if there exists a point $P$ that lies on all the planes.

Also see

• Definition:Collinear
• Definition:Coplanar

• Results about copunctality can be found here.

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): copunctal
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): copunctal