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Linear essential spectrum compressors

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Abstract (2. Language): 
Let A be a unital C-algebra of real rank zero and B be a unital semisimple complex Banach algebra. We characterize linear maps from A onto B that compress di erent essential spectral sets such as the (left, right) essential spectrum, the semi-Fredholm spectrum, and theWeyl spectrum. Essentially spectrally bounded linear mappings from A onto B are also characterized.
1058
1066

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