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A knot equivalent to a polygon in , also called a tame knot. For a polygonal knot , there exists a plane such that the orthogonal projection on it satisfies the following conditions:
1. The image has no multiple points other than a finite number of double points.
2. The projections of the vertices of are not double points of .
Such a projection is called a regular knot projection.
REFERENCES:
Iyanaga, S. and Kawada, Y. (Eds.). Encyclopedic Dictionary of Mathematics. Cambridge, MA: MIT Press, p. 735, 1980.
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