A negative answer is given to the second question posed on page 210 of the book Complex Analysis — 199 Research Problems, Lecture Notes in Math., No. 1043, Springer, Berlin (1984).
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Translated from Teoriya Funktsii, Funktsional'nyi Analiz i Ikh Prilozheniya, No. 45, pp. 96–97, 1986.
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Ostrovskii, M.I. Diminishing of the spectrum of an operator under extension. J Math Sci 48, 450–451 (1990). https://doi.org/10.1007/BF01097575
- Lecture Note
- Complex Analysis
- Research Problem
- Negative Answer
- Book Complex