Uniqueness of Walkup's 9-vertex 3-dimensional Klein bottle

Universal acyclic resolutions for arbitrary coefficient groups

Universal Algebras of Hurwitz Numbers

Universal bounds for hyperbolic Dehn surgery

Universal circles for quasigeodesic flows

Universal Cone Manifolds and the Poincaré Conjecture I

Universal Khovanov-Rozansky sl(2) cohomology

Universal Lefschetz fibrations over bounded surfaces

Universal manifold pairings and positivity

Universal Quadratic Forms and Untwisting Whitney Towers

Universal spaces for asymptotic dimension

Unknot diagrams requiring a quadratic number of Reidemeister moves to untangle

Unknotting and Ascending Numbers of Knots and their Families

Unknotting genus one knots

Unknotting information from Heegaard Floer homology

Unknotting number and number of Reidemeister moves needed for unlinking

Unknotting numbers of diagrams of a given nontrivial knot are unbounded

Unknotting surface links which are coverings of a trivial torus knot

Unknotting tunnels and Seifert surfaces

Unknotting Unknots