%0 Journal Article %T Moyennabilit¨¦ ¨¤ l'infini et exactitude d'un groupo£¿de ¨¦tale %A Ivan Lassagne %J Mathematics %D 2014 %I arXiv %X We give a definition of amenability at infinity for a locally compact, $\sigma$-compact and Hausdorff etale groupoid and we study in some case the exactness of the reduced $C^*$-algebra of a such groupoid. %U http://arxiv.org/abs/1410.8173v1