%0 Journal Article %T Roundness properties of ultrametric spaces %A Timothy Faver %A Katelynn Kochalski %A Mathav Murugan %A Heidi Verheggen %A Elizabeth Wesson %A Anthony Weston %J Mathematics %D 2012 %I arXiv %X We obtain several new characterizations of ultrametric spaces in terms of roundness, generalized roundness, strict p-negative type, and p-polygonal equalities (p > 0). This allows new insight into the isometric embedding of ultrametric spaces into Euclidean spaces. We also consider roundness properties additive metric spaces which are not ultrametric. %U http://arxiv.org/abs/1201.6669v5