@article{Filali_Protasov_2008, title={Spread of balleans}, volume={9}, url={https://polipapers.upv.es/index.php/AGT/article/view/1796}, DOI={10.4995/agt.2008.1796}, abstractNote={<p>A ballean is a set endowed with some family of balls in such a way that a ballean can be considered as an asymptotic counterpart of a uniform topological space. We introduce and study a new cardinal invariant called the spread of a ballean. In particular, we show that, for every ordinal ballean B, spread of B coincides with density of B.</p>}, number={2}, journal={Applied General Topology}, author={Filali, Mahmoud and Protasov, Igor V.}, year={2008}, month={Oct.}, pages={169–175} }