Abstract
Let D be a domain in the complex plane, let X be a complex Banach algebra and let f: D→X be a holomorphic mapping.
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Bibliography
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Vesentini, E. (1970). Maximum Theorems for Spectra. In: Essays on Topology and Related Topics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-49197-9_10
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