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math.GT2016★ 1 cited
Polynomial splittings of Ozsvath and Szabo's d-invariant
Yuanyuan Bao
For any rational homology 3-sphere and one of its spin^{c}-structures, Ozsvath and Szabo defined a topological invariant, called d-invariant. Given a knot in the 3-sphere, the d-in…
math.GT2016
On knots having zero negative unknotting number
Yuanyuan Bao
A knot in the 3-sphere is said to have zero negative unknotting number if it can be transformed into the unknot by performing only positive crossing changes. In this paper, we prov…