When It's open, It's closed, but when It's closed, It's open.

What is It?

A circle (or any other shape, for that matter)? When the shape is closed, it has no endpoints and could be considered an open set of points. But when the shape is open or 'broken,' it has two included endpoints, which are then a closed set of points.

Yeah, it's a stretch...

Posted by DJ on 2003-04-01 14:52:10