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math.GT2020
Unknottability of spatial graphs by region crossing changes
Yukari Funakoshi, Kenta Noguchi, Ayaka Shimizu
A region crossing change is a local transformation on spatial graph diagrams switching the over/under relations at all the crossings on the boundary of a region. In this paper, we…
math.GT2020
Prime alternating knots of minimal warping degree two
Ayaka Shimizu
The warping degree of an oriented knot diagram is the minimal number of crossing changes which are required to obtain a monotone knot diagram from the diagram. The minimal warping…