U(1)xSU(m)_1 Theory and c=m W_{1+\infty} Minimal Models in the Hierarchical Quantum Hall Effect
U(1)_R mediation from the flux compactification in six dimensions
U(1,1)--Invariant Generation of Charges for Einstein--Maxwell--Dilaton--Axion Theory
U(2) instantons and leptons
U(2) projectors and 't Hooft-Polyakov monopoles on a fuzzy sphere
U(2)-chiral symmetries of supersymmetric QED3
U(2,2) gravity on noncommutative space with symplectic structure
U(N) Framed Links, Three-Manifold Invariants, and Topological Strings
U(N) Gauge Model and Partial Breaking of N=2 Supersymmetry
U(N) Gauge Theory and Lattice Strings
U(N) Gauge Theory and Lattice Strings
U(N) Gauged N=2 Supergravity and Partial Breaking of Local N=2 Supersymmetry
U(N) Instantons on N=1/2 superspace -- exact solution & geometry of moduli space
U(n) Spectral Covers from Decomposition
U(N) spinning particles and higher spin equations on complex manifolds
U(n) Vector Bundles on Calabi-Yau Threefolds for String Theory Compactifications
U(N|M) quantum mechanics on Kaehler manifolds
U*(1,1) Noncommutative Gauge Theory As The Foundation of 2T-Physics in Field Theory
U-branes and T^3 fibrations
U-dual fluxes and Generalized Geometry