Conditions for hyponormality and invertibility of scaled sums of Toeplitz operators are studied, including the linear-functional symbol case.
A commutativity theorem for normal operators.Proceedings of the National Academy of Sciences of the United States of America, 36:35–40
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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.