Essentially Hankel Operators
Rubén Alejandro Martínez-Avendaño · Journal of the London Mathematical Society · 2002
The set of essentially Hankel operators is introduced and some of its properties are investigated. It is shown in particular that the set contains some operators not of the form ‘Hankel plus compact’, even when restricted to the class of essentially Hankel operators with trivial (Fredholm) index function.