Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6424647 | Topology and its Applications | 2015 | 6 Pages |
Abstract
There are two equivalent definitions of the bridge index of classical knots; one is the minimal number of the over-bridges, and the other is that of the maximal points with respect to a hight function. We consider these two indices for virtual and welded knots, and prove an inequality for virtual knots and the equality for welded knots.
Keywords
Related Topics
Physical Sciences and Engineering
Mathematics
Geometry and Topology
Authors
Yasutaka Nakanishi, Shin Satoh,