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Hwa-Long Gau, Chih-Jen Wang and Ngai-Ching Wong
Invertibility and Fredholmness of linear combinations of quadratic,
k
-potent and nilpotent operators
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Hwa-Long Gau
Chih-Jen Wang
Ngai-Ching Wong
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15A03
47A53
47C05
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invertibility
square zero elements
k
-potents
nilpotents
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