A classification of centrally-symmetric and cyclic 12-vertex triangulations of $S^2 \times S^2$

Details A classification of centrally-symmetric and cyclic 12-vertex triangulations of $S^2 \times S^2$ A classification of centrally-symmetric and cyclic 12-vertex triangulations of $S^2 \times S^2$

1998-12-03

arxiv.org/abs/math/9812024v1

Mathematics

Combinatorics

12 pages, 3 figures

Scientific paper

In this paper our main result states that there exist exactly three combinatorially distinct centrally-symmetric 12-vertex-triangulations of the product of two 2-spheres with a cyclic symmetry. We also compute the automorphism groups of the triangulations. These instances suggest that there is a triangulation of $S^2 \times S^2$ with 11 vertices -- the minimum number of vertices required.

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