Irreducible triangulations of surfaces with boundary

Details Irreducible triangulations of surfaces with boundary Irreducible triangulations of surfaces with boundary

2011-03-28

arxiv.org/abs/1103.5364v1

Mathematics

Combinatorics

Scientific paper

A triangulation of a surface is irreducible if no edge can be contracted to produce a triangulation of the same surface. In this paper, we investigate irreducible triangulations of surfaces with boundary. We prove that the number of vertices of an irreducible triangulation of a (possibly non-orientable) surface of genus g>=0 with b>=0 boundaries is O(g+b). So far, the result was known only for surfaces without boundary (b=0). While our technique yields a worse constant in the O(.) notation, the present proof is elementary, and simpler than the previous ones in the case of surfaces without boundary.

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