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math.GT2014★ 6 cited
The Rasmussen invariant, four-genus and three-genus of an almost positive knot are equal
Keiji Tagami
An oriented link is positive if it has a link diagram whose crossings are all positive. An oriented link is almost positive if it is not positive and has a link diagram with exactl…
math.GT2014★ 2 cited
Characterization of positive links and the -invariant for links
Tetsuya Abe, Keiji Tagami
We characterize positive links in terms of strong quasipositivity, homogeneity and the value of Rasmussen, Beliakova and Wehrli's -invariant. We also study almost positive links…