Hall‐Type Results for 3‐Connected Projective Graphs
2016
Projective planar graphs can be characterized by a set of 35 excluded minors. However, these 35 are not equally important. A set of 3-connected members of is excludable if there are only finitely many 3-connected nonprojective planar graphs that do not contain any graph in as a minor. In this article, we show that there are precisely two minimal excludable sets, which have sizes 19 and 20, respectively.
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