Timeline for Given a matrix, is there always another matrix which commutes with it?
Current License: CC BY-SA 4.0
19 events
| when toggle format | what | by | license | comment | |
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| Nov 10, 2021 at 8:08 | history | edited | user1551 | CC BY-SA 4.0 | Fix broken links |
| Dec 27, 2018 at 18:37 | comment | added | dezdichado | thanks a lot! I will work through it. | |
| Dec 26, 2018 at 23:37 | comment | added | Will Jagy | @dezdichado I put in an illustration of the final bit, what happens if a square block commutes with a single Jordan block, for sizes 2,3,4. Suggest you copy these out by hand, as it is a bit hard to make out where the elements of the matrices "jordan * symbols - symbols * jordan" start and stop. Everything must become zero in one of those, which leads to a very precise pattern in the original matrix "symbols." | |
| Dec 26, 2018 at 23:33 | history | edited | Will Jagy | CC BY-SA 4.0 | added 1397 characters in body |
| Dec 26, 2018 at 22:01 | comment | added | dezdichado | Apologies if this is too trivial, but is there a direct proof for the equivalence: $(1)\iff (2) ?$ | |
| Apr 13, 2017 at 12:58 | history | edited | CommunityBot | replaced http://mathoverflow.net/ with https://mathoverflow.net/ | |
| Apr 13, 2017 at 12:21 | history | edited | CommunityBot | replaced http://math.stackexchange.com/ with https://math.stackexchange.com/ | |
| Dec 28, 2015 at 20:23 | history | edited | Will Jagy | CC BY-SA 3.0 | added 317 characters in body |
| Nov 14, 2015 at 18:38 | history | edited | Will Jagy | CC BY-SA 3.0 | added 655 characters in body |
| Dec 24, 2013 at 20:49 | comment | added | Will Jagy | There are some very nice proofs of this fact: if you extend the field of consideration (such as the reals extended to the complexes) the minimal polynomial does not change!! See math.stackexchange.com/questions/136804/… | |
| Aug 6, 2012 at 19:12 | history | edited | Will Jagy | CC BY-SA 3.0 | added 279 characters in body |
| Aug 6, 2012 at 19:04 | history | edited | Will Jagy | CC BY-SA 3.0 | added 474 characters in body |
| Dec 20, 2011 at 5:50 | vote | accept | Strin | ||
| Dec 20, 2011 at 5:50 | |||||
| Dec 19, 2011 at 23:54 | history | edited | Will Jagy | CC BY-SA 3.0 | added 166 characters in body |
| Dec 19, 2011 at 23:08 | history | edited | Will Jagy | CC BY-SA 3.0 | added 177 characters in body |
| Dec 19, 2011 at 23:02 | history | edited | Will Jagy | CC BY-SA 3.0 | added 177 characters in body |
| Dec 19, 2011 at 22:43 | history | edited | Will Jagy | CC BY-SA 3.0 | added 114 characters in body |
| Dec 19, 2011 at 22:25 | history | edited | Will Jagy | CC BY-SA 3.0 | added 617 characters in body |
| Dec 19, 2011 at 22:04 | history | answered | Will Jagy | CC BY-SA 3.0 |