Browsing Faculty of Natural and Agricultural Sciences by Subject "Unbound operators"

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A Toeplitz-like operator with rational symbol having poles on the unit circle. I. Fredholm properties

Groenewald, G.J.; Ter Horst, S.; Ran, A.C.M.; Jaftha, J. (Springer, 2018)

In this paper a definition is given for an unbounded Toeplitzlike operator with rational symbol which has poles on the unit circle. It is shown that the operator is Fredholm if and only if the symbol has no zeroes on the ...