For example, a figure-8 is a wedge of two circles, and the wedge of three circles is a point with three loops coming from it.

The double curve for an immersed real projective plane forms a wedge of three circles, since it must have a triple point . This can be seen in the double curve of the polyhedral model presented here.

* 8/12/94 dpvc@geom.umn.edu -- *

*The Geometry Center*