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This paper is presented to honor ProfessorGottfried Köthe on his 60th birthday, December 25, 1965
This work was supported in part by the National Science Foundation under grant GP-1846.
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Taylor, A.E. Theorems on ascent, descent, nullity and defect of linear operators. Math. Ann. 163, 18–49 (1966). https://doi.org/10.1007/BF02052483
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DOI: https://doi.org/10.1007/BF02052483