[Une démonstration du théorème de Rado sans recourir au théorème de van der Waerden]
We present a proof of the sufficiency of Rado’s condition for the partition regularity of linear Diophantine equations that avoids any use of van der Waerden’s theorem. The proof is based on fundamental properties that are common knowledge in combinatorics of numbers and is entirely “elementary”.
Nous présentons une démonstration de la suffisance de la condition de Rado pour la régularité de partition des équations diophantiennes linéaires qui évite tout recours au théorème de van der Waerden. Cette démonstration repose sur des propriétés fondamentales bien connues en combinatoire des nombres et est entièrement « élémentaire », à la seule exception d’une application classique du principe de compacité.
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Keywords: Rado’s condition, van der Waerden, arithmetic Ramsey theory
Mots-clés : Condition de Rado, van der Waerden, théorie arithmétique de Ramsey
Mauro Di Nasso  1 ; Lorenzo Luperi Baglini  2
CC-BY 4.0
Mauro Di Nasso; Lorenzo Luperi Baglini. A van der Waerden-free proof of Rado’s theorem. Comptes Rendus. Mathématique, Volume 364 (2026), pp. 605-615. doi: 10.5802/crmath.852
@article{CRMATH_2026__364_G3_605_0,
author = {Mauro Di Nasso and Lorenzo Luperi Baglini},
title = {A {van~der~Waerden-free} proof of {Rado{\textquoteright}s} theorem},
journal = {Comptes Rendus. Math\'ematique},
pages = {605--615},
year = {2026},
publisher = {Acad\'emie des sciences, Paris},
volume = {364},
doi = {10.5802/crmath.852},
language = {en},
}
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