29 citations · 119 across the 22 of their papers we have counts for
6 papers · 1 filter
Integrating positive energy representations of the Virasoro algebra
André G. Henriques, James E. Tener
We show that every unitary positive energy representation W of the Virasoro algebra exponentiates to a holomorphic *-representation of the semigroup of annuli by bounded operators…
Singular values of weighted composition operators and second quantization
Mihai Putinar, James E. Tener
We study a semigroup of weighted composition operators on the Hardy space of the disk , and more generally on the Hardy space attached to a simply connect…
Unitary equivalence to a complex symmetric matrix: low dimensions
Stephan Ramon Garcia, Daniel E. Poore, James E. Tener
A matrix $T \in \M_n(\C)$ is \emph{UECSM} if it is unitarily equivalent to a complex symmetric (i.e., self-transpose) matrix. We develop several techniques for studying this proper…
Unitary equivalence to a complex symmetric matrix: an algorithm
James E. Tener
We present a necessary and sufficient condition for a 3 by 3 matrix to be unitarily equivalent to a symmetric matrix with complex entries, and an algorithm whereby an arbitrary 3 b…
Unitary equivalence of a matrix to its transpose
Stephan Ramon Garcia, James E. Tener
Motivated by a problem of Halmos, we obtain a canonical decomposition for complex matrices which are unitarily equivalent to their transpose (UET). Surprisingly, the naive assertio…
Projections and idempotents with fixed diagonal and the homotopy problem for unit tight frames
Julien Giol, Leonid V. Kovalev, David Larson +2
We investigate the topological and metric structure of the set of idempotent operators and projections which have prescribed diagonal entries with respect to a fixed orthonormal ba…