Projects per year
Abstract
We consider tropical hemispaces, defined as tropically convex sets whose complements are also tropically convex, and tropical semispaces, defined as maximal tropically convex sets not containing a given point. We introduce the concept of (P,R)-decomposition. This yields (to our knowledge) a new kind of representation of tropically convex sets extending the classical idea of representing convex sets by means of extreme points and rays. We characterize tropical hemispaces as tropically convex sets that admit a (P,R)-decomposition of certain kind. In this characterization, with each tropical hemispace we associate a matrix with coefficients in the completed tropical semifield, satisfying an extended rank-one condition. Our proof techniques are based on homogenization (lifting a convex set to a cone), and the relation between tropical hemispaces and semispaces.
Original language | English |
---|---|
Pages (from-to) | 131-163 |
Journal | Linear Algebra and its Applications |
Volume | 440 |
Early online date | 13 Nov 2013 |
DOIs | |
Publication status | Published - 1 Jan 2014 |
Keywords
- Tropical convexity
- Abstract convexity
- Max-plus algebra
- Hemispace
- Semispace
- Rank-one matrix
Fingerprint
Dive into the research topics of 'Characterization of tropical hemispaces by (P,R)-decompositions'. Together they form a unique fingerprint.Projects
- 1 Finished
-
Perron-Frobenius Theory and Max-Algebraic Combinatorics of Nonnegative Matrices
Butkovic, P.
Engineering & Physical Science Research Council
12/03/12 → 11/03/14
Project: Research Councils