Unitary equivalence to truncated Toeplitz operators

Unitary interpolants and factorization indices of matrix functions

Unitary loops and factorization

Unitary N-dilations for tuples of commuting matrices

Unitary orbits of Hermitian operators with convex or concave functions

Unitary perturbations of compressed N-dimensional shifts

Unitary Processes with Independent Increments

Unitary processes with independent increments and representations of Hilbert tensor algebras

Unitary Representations and Osterwalder-Schrader Duality

Unitary Representations of Lie Groups with Reflection Symmetry

Unitary systems and wavelet sets

Unitary systems, wavelet sets, and operator-theoretic interpolation of wavelets and frames

Universal commutative operator algebras and transfer function realizations of polynomials

Universal Non-Completely-Continuous Operators

Universal Spectra and Tijdeman's Conjecture on Factorization of Cyclic Groups

Universality of Newton's method

Unrestricted products of contractions in Banach spaces

Upper and Lower Bounds for Kronecker Constants of Three-Element Sets of Integers

Upper and lower estimates for schauder frames and atomic decompositions

Upper Beurling Density of Systems formed by Translates of finite Sets of Elements in $L^p(\R^d)$