Geodesic
Characterizations of Hankel operators in the essential commutant of quasicontinuous Toeplitz operators
Canadian mathematical bulletin, Tome 65 (2022) no. 1, pp. 44-51

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DOI

This note characterizes, in terms of interpolating Blaschke products, the symbols of Hankel operators essentially commuting with all quasicontinuous Toeplitz operators on the Hardy space of the unit circle. It also shows that such symbols do not contain the complex conjugate of any nonconstant singular inner function.
DOI : 10.4153/S0008439521000060
Mots-clés : Hankel operator, Toeplitz operator, quasicontinuous, Douglas algebra, interpolating Blaschke product, singular inner function 
Yan, Yi. Characterizations of Hankel operators in the essential commutant of quasicontinuous Toeplitz operators. Canadian mathematical bulletin, Tome 65 (2022) no. 1, pp. 44-51. doi: 10.4153/S0008439521000060
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