Conditions for hyponormality and invertibility of scaled sums of Toeplitz operators are studied, including the linear-functional symbol case.
On invariant subspaces and reflexive algebras.American Journal of Mathematics, 91(3):683–692
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Hyponormality of the sum of two Toeplitz operators
Conditions for hyponormality and invertibility of scaled sums of Toeplitz operators are studied, including the linear-functional symbol case.