Timeline for If $A,B$ are upper triangular matrices such that $AX=XA\implies BX=XB$ for upper triangular $X$, is $B$ a polynomial in $A$?
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| Jul 9, 2018 at 0:12 | comment | added | LSpice | I think that Lemma 5.1 says only 'only if', not 'if'; that is, conjugate nilpotent matrices need not have the same centraliser. | |
| Jul 8, 2018 at 23:23 | history | answered | Igor Rivin | CC BY-SA 4.0 |