On lattices of convex sets in R^n

Details On lattices of convex sets in R^n On lattices of convex sets in R^n

2004-09-16

arxiv.org/abs/math/0409288v1

Algebra universalis 53 (2005) 357-395

Mathematics

Metric Geometry

35 pages, to appear in Algebra Universalis, Ivan Rival memorial issue. See also http://math.berkeley.edu/~gbergman/papers

Scientific paper

10.1007/s00012-005-1934-0

Properties of several sorts of lattices of convex subsets of R^n are examined. The lattice of convex sets containing the origin turns out, for n>1, to satisfy a set of identities strictly between those of the lattice of all convex subsets of R^n and the lattice of all convex subsets of R^{n-1}. The lattices of arbitrary, of open bounded, and of compact convex sets in R^n all satisfy the same identities, but the last of these is join-semidistributive, while for n>1 the first two are not. The lattice of relatively convex subsets of a fixed set S \subseteq R^n satisfies some, but in general not all of the identities of the lattice of ``genuine'' convex subsets of R^n.

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