David E. Handelman (auth.)9780387184005, 0-387-18400-7
Emanating from the theory of C*-algebras and actions of tori theoren, the problems discussed here are outgrowths of random walk problems on lattices. An AGL (d,Z)-invariant (which is a partially ordered commutative algebra) is obtained for lattice polytopes (compact convex polytopes in Euclidean space whose vertices lie in Zd), and certain algebraic properties of the algebra are related to geometric properties of the polytope. There are also strong connections with convex analysis, Choquet theory, and reflection groups. This book serves as both an introduction to and a research monograph on the many interconnections between these topics, that arise out of questions of the following type: Let f be a (Laurent) polynomial in several real variables, and let P be a (Laurent) polynomial with only positive coefficients; decide under what circumstances there exists an integer n such that Pnf itself also has only positive coefficients. It is intended to reach and be of interest to a general mathematical audience as well as specialists in the areas mentioned. |
Table of contents :
Introduction….Pages 1-5
Definitions and notation….Pages 6-13
A random walk problem….Pages 14-27
Integral closure and cohen-macauleyness….Pages 28-40
Projective R K -modules are free….Pages 41-43
States on ideals….Pages 44-49
Factoriality and integral simplicity….Pages 50-59
Meet-irreducibile ideals in R K ….Pages 60-66
Isomorphisms….Pages 67-88 |
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