The rank of the difference of similar matrices
Portugaliae mathematica, Tome 46 (1989) no. 2, pp. 177-187.

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Keywords: rank of the difference of similar matrices, division ring
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     author = {Marques de S\'a, Eduardo},
     title = {The rank of the difference of similar matrices},
     journal = {Portugaliae mathematica},
     pages = {177--187},
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     number = {2},
     year = {1989},
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     zbl = {0682.15002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1989__46_2_115660/}
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Marques de Sá, Eduardo. The rank of the difference of similar matrices. Portugaliae mathematica, Tome 46 (1989) no. 2, pp. 177-187. http://geodesic.mathdoc.fr/item/PORMA_1989__46_2_115660/