A knot diagram which has alternating under- and overcrossings as the knot projection is traversed. The first knot which does not have an alternating diagram has 8 crossings.
Alternating Knot Diagram
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Cite this as:
Weisstein, Eric W. "Alternating Knot Diagram." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/AlternatingKnotDiagram.html