Lines pinning lines

Details Lines pinning lines Lines pinning lines

2010-02-17

arxiv.org/abs/1002.3294v1

Mathematics

Metric Geometry

27 pages, 10 figures

Scientific paper

A line g is a transversal to a family F of convex polytopes in 3-dimensional space if it intersects every member of F. If, in addition, g is an isolated point of the space of line transversals to F, we say that F is a pinning of g. We show that any minimal pinning of a line by convex polytopes such that no face of a polytope is coplanar with the line has size at most eight. If, in addition, the polytopes are disjoint, then it has size at most six. We completely characterize configurations of disjoint polytopes that form minimal pinnings of a line.

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