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Light paths with an odd number of vertices in polyhedral maps. (English) Zbl 1079.05502

Summary: Let \(P_k\) be a path on \(k\) vertices. In an earlier paper we have proved that each polyhedral map \(G\) on any compact \(2\)-manifold \(\mathbb M\) with Euler characteristic \(\chi (\mathbb M)\leq 0\) contains a path \(P_k\) such that each vertex of this path has, in \(G\), degree \(\leq k\lfloor A \rfloor \) with \(2A = 5+ \sqrt {49-24\chi (\mathbb M)}\). Moreover, this bound is attained for \(k=1\) or \(k\geq 2\), \(k\) even. In this paper we prove that for each odd \(k\geq \frac 43 \lfloor A\rfloor +1\), this bound is the best possible on infinitely many compact \(2\)-manifolds, but on infinitely many other compact \(2\)-manifolds the upper bound can be lowered to \(\lfloor (k-\frac 13)A\rfloor \).

MSC:

05C10 Planar graphs; geometric and topological aspects of graph theory
05C38 Paths and cycles
52B10 Three-dimensional polytopes
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References:

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