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math.GT2001
Embedded spheres and 4-manifolds with spin coverings
Christian Bohr
A strategy for constructing an embedded sphere in a 4-manifold realizing a given homology class which has been successfully applied in the past is to represent the class as a first…
math.GT2001
On the kinkiness of closed braids
Christian Bohr
In this note, we prove a lower bound for the positive kinkiness of a closed braid which we then use to derive an estimate for the positive kinkiness of a link in terms of its Seife…
math.GT2001
Homology cobordism and classical knot invariants
Christian Bohr, Ronnie Lee
In this paper we define and investigate Z/2-homology cobordism invariants of Z/2-homology 3-spheres which turn out to be related to classical invariants of knots. As an application…