7 citations · 8 across the 3 of their papers we have counts for
3 papers
math.CV2026
Two-Variable Compressions of Shifts, Toeplitz Operators, and Numerical Ranges
Kelly Bickel, Katie Quertermous, Matina Trachana
This paper studies two-variable compressions of shifts associated to rational inner functions on the bidisk; these generalize the classical compressions of the shift associated to…
math.FA2012★ 1 cited
Fixed Point Composition and Toeplitz-Composition C*-algebras
Katie S. Quertermous
Let be a linear-fractional, non-automorphism self-map of that fixes and satisfies and consider the composition operator $C…
math.FA2009★ 7 cited
A Semigroup Composition C*-algebra
Katie S. Quertermous
For 0 < s < 1, let phi_s(z)=sz+(1-s). We investigate the unital C*-algebra generated by the semigroup {C_{phi_s} : 0 < s < 1} of composition operators acting on the Hardy space of…