Rank-3 Projections of a 4-Cube

Details Rank-3 Projections of a 4-Cube Rank-3 Projections of a 4-Cube

2012-04-16

arxiv.org/abs/1204.3468v2

Mathematics

Metric Geometry

12 pages; corrected/added general moments of surface area

Scientific paper

The orthogonal projection of a 4-cube onto a uniform random 3-subspace in R^4 is a convex 3-polyhedron P with 14 vertices almost surely. Three numerical characteristics of P -- volume, surface area and mean width -- are studied. These quantities, along with the Euler characteristic, form a basis of the space of all additive continuous measures that are invariant under rigid motions in R^3. While computing statistics of {vl, ar, mw}, we encounter the generalized hypergeometric function, elliptic integrals and Catalan's constant. A new constant 7.1185587167... also arises and deserves further attention.

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