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Euclidean, hyperbolic, discrete, convex, coarse geometry, metric spaces, comparisons in Riemannian geometry, symmetric spaces.

5 votes
2 answers
276 views

What is the smallest diameter ring a non-convex polyhedron can pass through in 3-space?

The question is mostly in the title: What is the smallest diameter ring a non-convex polyhedron can pass through in 3-space? Imagine I have some non-convex polyhedron $P$, and I would like to …
10 votes
2 answers
523 views

When does every point in a polytope lie along a chord between its edges?

Consider the 3-simplex, or tetrahedron, in 3-space. Regardless of the positions of the vertices, every point in the simplex lies on a chord between two non-adjacent edges of the simplex. Or, equival …