In 1974 Perko discovered a duplication in the Tait-Little tables, called the Perko pair.
This duplication had been missed by John Horton Conway several years before in his knot table and subsequently found its way into Rolfsen's table.
For non-alternating knots this conjecture is not true, assuming so lead to the duplication of the Perko pair, because it has two reduced projections with different writhe.
Dirty Pair | base pair | Pair (parliamentary convention) | Hoogsteen base pair | Perko pair | Pair skating | pair skating | Pair of Kings | pair | Gelfand pair | Cooper pair | women's coxless pair | pair (cricket) | Pair a Dice Found | Ethernet over twisted pair | Closest pair of points problem | Blumlein Pair | Base pair | Au Pair II | A pair of king's earrings, made from gold and jade, early 6th century (Baekje). From tomb of Muryeong of Baekje | A Pair of Blue Eyes |