Some knots are the same as their mirror images. Consider the Figure8 knot

reflect in plane 








The two rotations about perpendicular axes could be combined into a rotation about a single axis.
Another achiral knot is 8_{3}.

reflect in plane 








As for the Figure8 knot, the two rotations about perpendicular axes could be combined into a rotation about a single axis.
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Copyright © 1998 by Robert G. Scharein