%0 Journal Article %T Atomic toposes and countable categoricity %A Olivia Caramello %J Mathematics %D 2008 %I arXiv %X We give a model-theoretic characterization of the class of geometric theories classified by an atomic topos having enough points; in particular, we show that every complete geometric theory classified by an atomic topos is countably categorical. Some applications are also discussed. %U http://arxiv.org/abs/0811.3547v1