 |
Université Jean Monnet – Saint-Etienne |  |
Journal articles
Approximate roots of a valuation and the Pierce-Birkhoff Conjecture
Abstract : This paper is a step in our program for proving the Piece-Birkhoff Conjecture for regular rings of any dimension (this would contain, in particular, the classical Pierce-Birkhoff conjecture which deals with polynomial rings over a real closed field). We first recall the Connectedness and the Definable Connectedness conjectures, both of which imply the Pierce - Birkhoff conjecture. Then we introduce the notion of a system of approximate roots of a valuation v on a ring A (that is, a collection Q of elements of A such that every v-ideal is generated by products of elements of Q). We use approximate roots to give explicit formulae for sets in the real spectrum of A which we strongly believe to satisfy the conclusion of the Definable Connectedness conjecture. We prove this claim in the special case of dimension 2. This proves the Pierce-Birkhoff conjecture for arbitrary regular 2-dimensional rings.
https://hal-ujm.archives-ouvertes.fr/ujm-00461549
Contributor : Daniel Schaub Connect in order to contact the contributor
Submitted on : Thursday, February 9, 2012 - 5:11:47 PM
Last modification on : Monday, April 4, 2022 - 3:24:12 PM
Long-term archiving on: : Thursday, May 10, 2012 - 2:58:02 AM
Contributor : Daniel Schaub Connect in order to contact the contributor
Submitted on : Thursday, February 9, 2012 - 5:11:47 PM
Last modification on : Monday, April 4, 2022 - 3:24:12 PM
Long-term archiving on: : Thursday, May 10, 2012 - 2:58:02 AM
Files
approximatelastversion.pdf
Files produced by the author(s)