On locally convex PL-manifolds and fast verification of convexity

Details On locally convex PL-manifolds and fast verification of convexity On locally convex PL-manifolds and fast verification of convexity

2003-09-23

arxiv.org/abs/math/0309370v2

Mathematics

Metric Geometry

10 pages (abbreviated version). Significantly different from all older versions. Discount the previous version -- it had many

Scientific paper

We show that a realization of a closed connected PL-manifold of dimension n-1 in Euclidean n-space (n>2) is the boundary of a convex polyhedron if and only if the interior of each (n-3)-face has a point, which has a neighborhood lying on the boundary of a convex n-dimensional body. This result is derived from a generalization of Van Heijenoort's theorem on locally convex manifolds to spherical spaces. We also give a brief analysis of how local convexity and topology of non-compact surfaces are related to global convexity in the hyperbolic space. Our convexity criterion for PL-manifolds imply an easy polynomial-time algorithm for checking convexity of a given closed compact PL-surface in Euclidean of spherical space of dimension n>2.

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