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Asymptotic height optimization for topical IFS, Tetris heaps, and the finiteness conjecture
Author(s):
Thierry
Bousch;
Jean
Mairesse
Journal:
J. Amer. Math. Soc.
15
(2002),
77-111.
MSC (2000):
Primary 49J27, 37D35
Posted:
September 10, 2001
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Abstract:
Given an Iterated Function System (IFS) of topical maps verifying some conditions, we prove that the asymptotic height optimization problems are equivalent to finding the extrema of a continuous functional, the average height, on some compact space of measures. We give general results to determine these extrema, and then apply them to two concrete problems. First, we give a new proof of the theorem that the densest heaps of two Tetris pieces are sturmian. Second, we construct an explicit counterexample to the Lagarias-Wang finiteness conjecture for the joint spectral radius of a set of matrices. RÉSUMÉ. Etant donné un système itéré de fonctions (IFS) topicales, vérifiant certaines conditions, nous montrons que les questions d'optimisation asymptotique de la hauteur sont équivalentes à la recherche des extrema d'une fonctionnelle continue, la hauteur moyenne, sur un certain espace compact de mesures. Nous présentons des résultats généraux permettant de déterminer ces extrema, puis appliquons ces méthodes à deux problèmes concrets. Premièrement, nous redémontrons que les empilements les plus denses de deux pièces de Tetris sont sturmiens. Deuxièmement, nous construisons un contre-exemple effectif à la conjecture de finitude de Lagarias et Wang sur le rayon spectral joint d'un ensemble de matrices.
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Additional Information:
Thierry
Bousch
Affiliation:
Laboratoire de Mathématique (UMR 8628 du CNRS), bât. 425, Université de Paris-Sud, 91405 Orsay Cedex, France
Email:
Thierry.Bousch@math.u-psud.fr
Jean
Mairesse
Affiliation:
LIAFA, CNRS et Université Paris 7, case 7014, 2 place Jussieu, 75251 Paris Cedex 05, France
Email:
Jean.Mairesse@liafa.jussieu.fr
DOI:
10.1090/S0894-0347-01-00378-2
PII:
S 0894-0347(01)00378-2
Keywords:
Topical maps,
max-plus automata,
Tetris,
sturmian processes,
optimal control,
finiteness conjecture. ( Mots-clés. Applications topicales,
automates max-plus,
Tetris,
processus sturmiens,
contrôle optimal,
conjecture de finitude.)
Received by editor(s):
July 11, 2000
Posted:
September 10, 2001
Additional Notes:
The work of the second author was partially supported by the European Community Framework IV programme through the research network ALAPEDES (``The ALgebraic Approach to Performance Evaluation of Discrete Event Systems'')
Copyright of article:
Copyright
2001,
American Mathematical Society
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