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Minimal vertex degree sum of a 3-path in plane maps. (English) Zbl 0906.05017
A plane map is normal if every face and every vertex of the map is incident with at least three edges. Let \(w_k\) be the minimum degree sum, in a graph \(G\), of the vertices on a path of order \(k\) in \(G\). The author shows that, for normal plane maps: (1) If \(w_2= 6\), then \(w_3\) can be arbitrarily large. (2) If \(w_2> 6\), then either \(w_3\leq 18\) or there is a vertex of degree at most 15 adjacent to two vertices of degree 3. (3) If \(w_2>7\), then \(w_3\leq 17\).

MSC:
05C10 Planar graphs; geometric and topological aspects of graph theory
05C38 Paths and cycles
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