Title: |
Odd Crossing Number Is Not Crossing Number |

Authors: |
Michael J. Pelsmajer, Marcus Schaefer, Daniel Štefankovič |

Abstract: |
The crossing number of a graph is the minimum number of edge intersections in a plane drawing of a graph, where each intersection is counted separately. If instead we count the number of pairs of edges that intersect an odd number of times, we obtain the odd crossing number. We show that there is a graph for which these two concepts differ, answering a well-known open question on crossing numbers. To derive the result we study drawings of maps on the annulus. |

Keywords: |
Crossing number, odd crossing number, pair crossing number |

Full Paper: |
[ps, pdf] |