Bourgin–Yang-type theorem for -compact perturbations of closed operators. I: The case of index theories with dimension property.
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Antonyan, Sergey A., Balanov, Zalman I., Gel'man, Boris D. (2006)
Abstract and Applied Analysis
Balanov, Z., Krawcewicz, W., Kushkuley, A. (1998)
Abstract and Applied Analysis
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