2004
DOI: 10.1007/s00454-004-1097-3
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Abstract: We present a 16-vertex tetrahedralization of S 3 (the 3-sphere) for which no topological bistellar flip other than a 1-to-4 flip (i.e., a vertex insertion) is possible. This answers a question of Altshuler et al. which asked if any two n-vertex tetrahedralizations of S 3 are connected by a sequence of 2-to-3 and 3-to-2 flips. The corresponding geometric question is whether two tetrahedralizations of a finite point set S in R 3 in "general position" are always related via a sequence of geometric 2-to-3 and 3-t…

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