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An alternating link is a link which has a link diagram with alternating underpasses and overpasses.
The proportion of links which are alternating tends exponentially to zero with increasing crossing number (Sundberg and Thistlethwaite 1998, Thistlethwaite 1998).
." Math. Intell. 20,
33-48, Fall 1998.Menasco, W. and Thistlethwaite, M. "The Classification
of Alternating Links." Ann. Math. 138, 113-171, 1993.Sundberg,
C. and Thistlethwaite, M. "The Rate of Growth of the Number of Prime Alternating
Links and Tangles." Pacific J. Math. 182, 329-358, 1998.Thistlethwaite,
M. "On the Structure and Scarcity of Alternating Links and Tangles." J.
Knot Th. Ramifications 7, 981-1004, 1998.Weisstein, Eric W. "Alternating Link." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/AlternatingLink.html