Browsing Research Output by Author "Xu, Quanhua"
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A Helson-Szegö theorem for subdiagonal subalgebras with applications to Toeplitz operators
Labuschagne, Louis E.; Xu, Quanhua (Elsevier, 2013)We formulate and establish a noncommutative version of the well known Helson–Szegö theorem about the angle between past and future for subdiagonal subalgebras. We then proceed to use this theorem to characterise the ...