Coordinate Axes are Copunctal

Theorem

Let $\CC$ be a coordinate system in ordinary $3$-dimensional space.

Then the coordinate axes of $S$ are copunctal.

Proof

Implicit by definition of coordinate system.

$\blacksquare$

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