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# Measure Theoretic Laws for Lim Sup Sets

Victor Beresnevich, Detta Dickinson, Sanju Velani

92 pages, parution le 29/06/2006

## Résumé

Given a compact metric space $(\Omega,d)$ equipped with a non-atomic, probability measure $m$ and a positive decreasing function $\psi$, we consider a natural class of lim sup subsets $\Lambda(\psi)$ of $\Omega$. The classical lim sup set $W(\psi)$ of `$\p$-approximable' numbers in the theory of metric Diophantine approximation fall within this class. We establish sufficient conditions (which are also necessary under some natural assumptions) for the $m$-measure of $\Lambda(\psi)$ to be either positive or full in $\Omega$ and for the Hausdorff $f$-measure to be infinite. The classical theorems of Khintchine-Groshev and Jarník concerning $W(\psi)$ fall into our general framework. The main results provide a unifying treatment of numerous problems in metric Diophantine approximation including those for real, complex and $p$-adic fields associated with both independent and dependent quantities. Applications also include those to Kleinian groups and rational maps. Compared to previous works our framework allows us to successfully remove many unnecessary conditions and strengthen fundamental results such as Jarník's theorem and the Baker-Schmidt theorem. In particular, the strengthening of Jarník's theorem opens up the Duffin-Schaeffer conjecture for Hausdorff measures.

## Sommaire

• Introduction
• Ubiquity and conditions on the general setp
• The statements of the main theorems
• Remarks and corollaries to Theorem 1
• Remarks and corollaries to Theorem 2
• The classical results
• Hausdorff measures and dimension
• Positive and full $m$-measure sets
• Proof of Theorem 1
• Proof of Theorem 2: $0\leq G < \infty$
• Proof of Theorem 2: $G= \infty$
• Applications
• Bibliography
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## Caractéristiques techniques

 PAPIER Éditeur(s) American Mathematical Society (AMS) Auteur(s) Victor Beresnevich, Detta Dickinson, Sanju Velani Collection Memoirs of the American Mathematical Society Parution 29/06/2006 Nb. de pages 92 Format 17,5 x 25 Couverture Broché Poids 223g Intérieur Noir et Blanc EAN13 9780821838273 ISBN13 978-0-8218-3827-3

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