Ubiquitous systems and metric number theory

Ultrametric skeletons

Ultrametric subsets with large Hausdorff dimension

Ultrametricity and metric betweenness in tangent spaces to metric spaces

Ultrarigid tangents of sub-Riemannian nilpotent groups

Umbrellas and polytopal approximation of the euclidean ball

Uniform Local Amenability

Uniform Model of Geometric Spaces

Uniform partitions of 3-space, their relatives and embedding

Uniform refinements, topological derivative and a differentiation theorem in metric spaces

Uniform Theory of Geometric Spaces

Uniformly distributed distances: A geometric application of Jansen's inequality

Uniquely constructed figures

Uniqueness and Symmetry in Problems of Optimally Dense Packings

Uniqueness in Discrete Tomography of Delone Sets with Long-Range Order

Uniqueness in Discrete Tomography of Planar Model Sets

Uniqueness of radial centers of parallel bodies

Uniqueness of the (22,891,1/4) spherical code

Unit distances and diameters in Euclidean spaces

Universal Hyperbolic Geometry I: Trigonometry