6 research outputs found
Many, many more intrinsically knotted graphs
We list more than 200 new examples of minor minimal intrinsically knotted
graphs and describe many more that are intrinsically knotted and likely minor
minimal.Comment: 19 pages, 16 figures, Appendi
Complete Minors in Complements of Non-Separating Planar Graphs
We prove that the complement of any non-separating planar graph of order
contains a minor, and argue that the order is lowest
possible with this property. To illustrate the necessity of the non-separating
hypothesis, we give an example of a planar graph of order 11 whose complement
does not contain a minor. We argue that the complements of planar graphs
of order 11 are intrinsically knotted. We compute the Hadwiger numbers of
complements of wheel graphs.Comment: 13 pages, 8 figure