Abstract
For any given finite group, Schulte and Williams (Discrete Comput Geom 54(2):444–458, 2015) establish the existence of a convex polytope whose combinatorial automorphisms form a group isomorphic to the given group. We provide here a shorter proof for a stronger result: the convex polytope we build for the given finite group is binary, and even combinatorial in the sense of Naddef and Pulleyblank (J Combin Theory Ser B 31(3):297–312, 1981); the diameter of its skeleton is at most 2; any combinatorial automorphism of the polytope is induced by some isometry of the space; any automorphism of the skeleton is a combinatorial automorphism.
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Acknowledgements
We would like to thank Selim Rexhep, a past Ph.D. student, for his many interesting questions and in particular the one asking for the existence of a convex polytope for any finite group. We thank also two anonymous reviewers for their useful comments on a preliminary version.
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Editor in Charge: Günter M. Ziegler, János Pach
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Doignon, JP. Any Finite Group is the Group of Some Binary, Convex Polytope. Discrete Comput Geom 59, 451–460 (2018). https://doi.org/10.1007/s00454-017-9945-0
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DOI: https://doi.org/10.1007/s00454-017-9945-0