We prove that there exists a projection P having the following properties. P is not the projection of any unknotted knot. The singular point set of P consists of double points.
P is the projection of an n -knot which is diffeomorphic to the standard sphere.
Note that the second theorem is different from the first one. The projections of n -knots, Kummer surface, Spun knots. This research was partially supported by Research Fellowships of the Promotion of Science for Young Scientists. Back to Contents of Vol.