English

Simple Riesz groups having wild intervals

Operator Algebras 2007-05-23 v1 K-Theory and Homology

Abstract

We prove that every partially ordered simple group of rank one which is not Riesz embeds into a simple Riesz group of rank one if and only if it is not isomorphic to the additive group of the rationals. Using this result, we construct examples of simple Riesz groups of rank one GG, containing unbounded intervals (Dn)n1(D_n)_{n\geq 1} and DD, that satisfy: (a) For each n1n\geq 1, tDnG+tD_n\ne G^+ for every t<qnt< q_n, but qnDn=G+q_nD_n=G^+ (where (qn)(q_n) is a sequence of relatively prime integers); (b) For every n1n\geq 1, nDG+nD\ne G^+. We sketch some potential applications of these results in the context of K-Theory.

Cite

@article{arxiv.math/0405035,
  title  = {Simple Riesz groups having wild intervals},
  author = {Francisco Ortus and Enric Pardo and Francesc Perera},
  journal= {arXiv preprint arXiv:math/0405035},
  year   = {2007}
}

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27 pages